Rejuvenation of vacuum tower bottoms through bio-derived materials

ABSTRACT

The present invention relates to an asphalt product. The asphalt product includes an asphalt binder and a bio-oil blend comprising a mixture of a non-hydrogenated bio-oil and a partially hydrogenated bio-oil, where the bio-oil blend is mixed with the asphalt binder to form an asphalt product having a shear stiffness of 0.20 kPa to 11,000 kPa at a temperature ranging from 25° C. to 85° C. and/or a viscosity of 0.15 Pa·s to 1.50 Pa·s at a temperature ranging from 120° C. to 165° C. The present invention further relates to methods of producing an asphalt product and methods of applying an asphalt product to a surface.

This application claims the benefit of U.S. Provisional PatentApplication Ser. No. 62/301,092, filed Feb. 29, 2016, which is herebyincorporated by reference in its entirety.

FIELD OF THE INVENTION

The present application relates to the rejuvenation of vacuum towerbottoms through use of bio-derived materials and methods of making andusing the vacuum tower bottoms.

BACKGROUND OF THE INVENTION

The process of oil refining distills crude oil into different fractionsas part of the manufacturing for many products. Asphalt binder is one ofthe heaviest fractions produced during refining of petroleum crude, andis a co-product of the oil refining process. The lighter petroleum crudefractions are used for making higher economic value products such asgasoline and specialty chemicals, and their value is tied to the priceof oil. When the price of oil increases, lighter component products suchas gasoline increase in price, thus incentivizing increased productionof said lighter components during petroleum crude refining. To increaseproduction of higher economic value lighter components, refineriesequipped with vacuum tower equipment run vacuum distillation to extractmore from crude oil. From this process vacuum tower distillation bottoms(“VTB”) are produced. VTB is very stiff due to the loss of saturatesfrom the vacuum tower distillation process to produce more lightercomponents, and thus is not typically used wholly for paving a roadwayas an asphalt binder and can be terminally blended for producing theappropriate asphalt binder grade.

There are many different terms used for materials that restore an agedbinder rheological properties similar to its original unaged state.These terms are used interchangeably as rejuvenators, recycling agents,softening agents, fluxes, and extenders. These materials are then namedinterchangeably as either modifiers or additives. Restoration isachieved through the renewal of the volatiles and oils generallyimproving flexibility and adhesion properties.

During the construction and service life of a pavement asphalt bindermaterial properties change in such a way that asphalt binders becomestiffer and less resistive to fatigue/low temperature cracking. This isbecause a binder's volatile components evaporate and oxidize from thetime it is constructed to the end of its service life. Oxidation of thebinder over its service life causes polymerization to occur.Polymerization is the process by which the binder becomes more viscousat high temperatures and less viscous at low temperatures, thus calledaging (Gerardu, J. & Hendriks, C. F., “Recycling of Road PavementMaterials in the Netherlands,” In: Road Engineering division ofRijkswaterstaat, Delft.). The main determinant of an asphalt's viscosityis based on the amount of asphaltenes in the binder because they aremore viscous than both resins and oils (Airey, G. D., “RheologicalProperties of Styrene Butadiene Styrene Polymer Modified Road Bitumen,”Fuel 82:1709-19 (2003); Wu et al. “Investigation of TemperatureCharacteristics of Recycled Hot Mix Asphalt Mixtures,” Resour. Conserv.Recycl. 51:610-20 (2007). From oxidation the oil component in asphalt isconverted to resins and the resin component is converted to asphaltenes.This is the reason hardening occurs in asphalt over time (Wu et al.“Investigation of Temperature Characteristics of Recycled Hot MixAsphalt Mixtures,” Resour. Conserv. Recycl. 51:610-20 (2007); Kandhal etal., “Performance of Recycled Hot Mix Asphalt Mixtures,” National Centerfor Asphalt Technology Auburn (1995)). Rejuvenators are materials thatcontain saturates/oils and through a certain method of application areable to restore partially to fully the oxidized asphalt binderproperties to its original viscoelastic state (Brownridge, J., “The Roleof an Asphalt Rejuvenator in Pavement Preservation: Use and Need forAsphalt Rejuvenation,” In: Compendium of Papers From the FirstInternational Conference on Pavement Preservation, Newport Beach, Calif.p. 351-64).

Several studies have been published investigating the use ofrejuvenators with laboratory-aged asphalt binder, recovered binder fromrecycled asphalt pavement (“RAP”) and by applying rejuvenators onhigh-RAP mixtures. Rejuvenators act to restore an aged asphalt binder'srheological properties. Asphalt binder restoration is the process inwhich volatiles and oils are renewed while still keeping the adhesionproperties stable. The intent is for a rejuvenator to return the ratioof asphaltenes/maltenes (resigns and oils) in an aged asphalt binder toits original (i.e., virgin, unaged) state (Asli et al., “Investigationon Physical Properties of Waste Cooking Oil—Rejuvenated Bitumen Binder,”Constr. Build. Mater. 37:398-405 (2012); Chen et al., “Physical,Chemical and Rheological Properties of Waste Edible Vegetable OilRejuvenated Asphalt Binders,” Constr. Build. Mater. 66:286-298 (2014);Chen et al., “High Temperature Properties of Rejuvenating RecoveredBinder with Rejuvenator, Waste Cooking and Cotton Seed Oils,” Constr.Build. Mater. 59:10-16 (2014); D'Angelo et al., “Asphalt BinderModification with Re-Refined Heavy Vacuum Distillation Oil (RHVDO),”Fifty-Seventh Annual Conference of the Canadian Technical AsphaltAssociation (CTAA) (2012); Johnson & Hesp, “Effect of Waste Engine OilResidue on the Quality and Durability of SHRP MRL Binders,”Transportation Research Board 93rd Annual Meeting (2014); Romera et al.,“Rheological Aspects of the Rejuvenation of Aged Bitumen,” Rheol Acta45:474-478 (2006); Zargar et al., “Investigation of the Possibility ofUsing Waste Cooking Oil as a Rejuvenating Agent for Aged Bitumen,” J.Hazard. Mater. 233-234, 254-258 (2012)).

Currently, the increased use of recycled asphalt pavement (“RAP”) in hotmix asphalt (“HMA”) mixtures has caused use of rejuvenators to increase(Shen et al., “Effects of Rejuvenating Agents on Superpave MixturesContaining Reclaimed Asphalt Pavement,” J. Mater. Civ. Eng. 19:376-384(2007)). Literature shows that as the dosage of rejuvenators in RAPextracted and recovered binder increase, both high and low temperatureperformance grade (“PG”) temperatures decrease linearly (Shen et al.,“Effects of Rejuvenating Agents on Superpave Mixtures ContainingReclaimed Asphalt Pavement,” J. Mater. Civ. Eng. 19:376-384 (2007); Maet al., “Compound Rejuvenation of Polymer Modified Asphalt Binder,”Journal of Wuhan University of Technology, Mater Sci. Ed. 25:1070-1076(2010); Shen et al., “Effects of Rejuvenating Agents on SuperpaveMixtures Containing Reclaimed Asphalt Pavement,” J. Mater. Civ. Eng.19:376-384 (2007); Shen & Ohne, “Determining Rejuvenator Content forRecycling Reclaimed Asphalt Pavement by SHRP Binder Specifications,”Int. J. Pavement Eng. 3:261-268 (2002); Tran et al., “Effect ofRejuvenator on Performance Properties of HMA Mixtures with High RAP andRAS Contents,” Auburn, Ala.: National Center for Asphalt Technology(2012); Zaumanis et al., “Determining Optimum Rejuvenator Dose forAsphalt Recycling Based on Superpave Performance Grade Specifications,”Constr. Build. Mater. 69:159-166 (2014)). However, this decrease assistsin restoring the RAP extracted and recovered binder PG to virgin unagedPG grade or better (Zaumanis et al., “Determining Optimum RejuvenatorDose for Asphalt Recycling Based on Superpave Performance GradeSpecifications,” Constr. Build. Mater. 69:159-166 (2014)). Due to therestorative properties of rejuvenators to RAP and RAP extracted andrecovered binder, evaluation of waste products such as recycled motoroil (“RO”) for use as a rejuvenator has also been evaluated (Romera etal., “Rheological Aspects of the Rejuvenation of Aged Bitumen,” RheolActa 45:474-478 (2006)). In the work by Romera et al., “RheologicalAspects of the Rejuvenation of Aged Bitumen,” Rheol Acta 45:474-478(2006), it was found that by adding 20% RO to an aged asphalt binder(pen grade 0-10) they were able to achieve the same penetration grade asa commercially used pen grade 60/70. If RO can be successfully used as arejuvenator of RAP binders, then the same idea could work with vacuumtower bottoms (VTB) through the use of bio-derived materials (“BDMs”).

Vacuum tower distillation bottoms (“VTBs”), is an asphalt materialproduced from coking in petroleum refineries to increase production ofhigher economic value lighter components such as gasoline and jet fuel.Due to the loss of saturates from this process, VTBs are very stiff andare heavily limited for use in paving.

When considering what rejuvenator to use in aged asphalt binder animportant item to examine is the effect of the rejuvenator on theoxidative aging of the restored binder. Asphalt oxidation occurs when anasphalt's molecules are exposed over time to “polar, oxygen-containingchemical functionalities” causing the asphalt to harden (Petersen, J.C., “A Review of the Fundamentals of Asphalt Oxidation: Chemical,Physicochemical, Physical Property, and Durability Relationships,”Transportation Research E-Circular (E-C140) (2009)). Depending on how anasphalt binder is affected by oxidation it could shorten a pavement'sservice life because of substantial premature fatigue cracking. Thechemical makeup of asphalt is categorized into four fractions:asphaltenes, saturates, aromatics, and resins. Changing the proportionsof the four fractions in an asphalt binder will change the performancegrade either making it stiffer or softer. Asphaltenes (heaviercomponent) are the portion of asphalt that gives asphalt its stiffness,while the other three fractions—maltenes (saturates, aromatics, andresins), the lighter components give asphalt its softening effect(Petersen, J. C., “A Review of the Fundamentals of Asphalt Oxidation:Chemical, Physicochemical, Physical Property, and DurabilityRelationships,” Transportation Research E-Circular (E-C140) (2009)).

For simulating field aging of asphalt binder in the laboratory there arethree stages of aging; unaged, short-term aged, and long-term agedtesting. During short-term aging, the binder hardens due to oxidationand volatilization of the lighter components to simulate manufacture andlaydown of pavement in the field, while long-term aging is caused byoxidation at in-service temperatures. Over both stages of aging theasphaltene content increases and the maltene content decreases, but atdifferent rates. In short-term aging, more of the maltene phase is lostdue to volatilization than due to chemical changing into asphaltenes. Inlong-term aging more maltenes are changed chemically into asphaltenesfrom oxidation than those lost to volatilization. As asphaltene contentincreases, flocculation and gelation of the colloidal structure areincreased, thus leading to higher viscosity/greater stiffening effect.As stated earlier the role of rejuvenators is to reverse the effect ofaging by returning the ratio of maltenes to asphaltenes in the agedbinder to its original state (Romera et al., “Rheological Aspects of theRejuvenation of Aged Bitumen,” Rheol Acta 45:474-478 (2006)).

Another impact from asphalt binder rejuvenation is that mixing andcompaction temperatures as determined through rotational viscositytesting decrease. Mix and compaction temperatures are important becausethey dictate what temperatures should be used in a hot mix asphalt plantduring the drying and mixing of aggregates with asphalt binder as wellas the laydown temperatures at the field site. Effects from reducedtemperatures are seen in the form of reduced fuel usage, cost savings,as well as reductions in greenhouse gas (GHG) emissions—CO₂, NO_(X),SO_(X), and CO. Like rejuvenators, warm mix asphalt technologies havesimilar effects on mixing and compaction temperatures of asphalt mix.There have been numerous studies done on warm mix asphalt (WMA)primarily concerned with the reduction in production temperatures, fuelusage, and emissions, as well as the cost savings associated with thesereductions (Almeida-Costa et al., “Economic and Environmental ImpactStudy of Warm Mix Asphalt Compared to Hot Mix Asphalt,” J. Clean. Prod.112:2308-2317. Part 4. (2016); Harder et al., “Energy and EnvironmentalGains of Warm and Half-Warm Asphalt Mix: Quantitative Approach,” In:Transportation Research Board 87th Annual Meeting (2008); and Rubio etal., “Warm Mix Asphalt: An Overview,” J. Clean. Prod. 24, 76-84 (2012)).The extreme of WMA is half warm mix asphalt (HWMA) which is produced ateven lower temperatures than those used for WMA. Rubio et al.,“Comparative Analysis of Emissions From the Manufacture and Use of Hotand Half-Warm Mix Asphalt,” J. Clean. Prod. 41:1-6 (2013) showed thatproduction of HWMA at temperatures between 60° C. and 100° C., reducedCO₂ and SO₂ emissions by 58.5% and 99.9% when compared to the emissionlevels of a HMA control produced between 150° C. and 190° C.

The present invention is directed to overcoming these and otherdeficiencies in the art.

SUMMARY OF THE INVENTION

One aspect of the present invention relates to an asphalt product. Theasphalt product includes an asphalt binder and a bio-oil blendcomprising a mixture of a non-hydrogenated bio-oil and a partiallyhydrogenated bio-oil, where the bio-oil blend is mixed with the asphaltbinder to form an asphalt product having a shear stiffness of 0.20 kPato 11,000 kPa at a temperature ranging from 25° C. to 85° C. and/or aviscosity of 0.15 Pa·s to 1.50 Pa·s at a temperature ranging from 120°C. to 165° C.

Another aspect of the present invention relates to a method of producingan asphalt product. The method includes providing an asphalt binder,where the binder is a vacuum tower distillation bottom; providing abio-oil blend comprising a mixture of a non-hydrogenated bio-oil and apartially hydrogenated bio-oil. The asphalt binder is mixed with thebio-oil blend under conditions effective to produce an improved asphaltproduct having a shear stiffness of 0.20 kPa to 11,000 kPa at atemperature ranging from 25° C. to 85° C. and/or a viscosity of 0.15Pa·s to 1.50 Pa·s at a temperature ranging from 120° C. to 165° C.

Another aspect relates to a method of applying an asphalt product to asurface. The method includes (a) providing an asphalt product, (b)heating the asphalt product to a temperature of 145° C. to 155° C. tocoat the mineral aggregate and produce an asphalt material which hasimproved rheological properties compared to that of an asphalt materialabsent the bio-derived material; (c) applying the heated asphaltmaterial to a surface to be paved to form an applied paving material;and (d) compacting the applied paving material.

The present invention creates a value added product by rejuvenating VTBwith bio-derived materials (“BDM”), by creating a blend of BDM and VTBthat will meet asphalt grade requirements for use in paving. There aretwo systems for measuring the grade of asphalt binder (bitumen),penetration grade (European standard) and performance grade (UnitedStates standard). The objective of the present invention is to usebio-derived materials (“BDMs”) to modify VTB to obtain asphaltproperties that are optimal for paving. BDMs are used in combination forreducing VTB stiffness. The original VTB material has a penetrationgrade of 20-30 and a performance grade (“PG”) 76-10.

Material evaluation included high temperature evaluation in a dynamicshear rheometer (“DSR”) as well as low temperature evaluation in abending beam rheometer (“BBR”) on short term and long term aged binders.A comprehensive experimental plan consisting of replicate samples wasused for grading according to American Association of State Highway andTransportation Officials (“AASHTO”) test methods. Material evaluationincluded both high and low temperature properties in a dynamic shearrheometer and bending beam rheometer, respectively after the requisiteshort and long-term aging. A total of eighteen groups including thecontrol VTB with performance grade (PG) 76-10 were used in theevaluation of the BDMs. VTBs blended with two BDMs achieved a PG 70-22and a 64-22; both are commonly used grades in the United States. Thedosage combinations of two BDMs, head bodied linseed oil (“HBO” or“HBL”) and partially hydrogenated heat bodied linseed oil (“PHBO” or“PHBL”) were analyzed using multiple regression to help quantify thebenefit. Findings from the multiple regression show that both BDMs mustbe used in combination for achieving the final performance grade. Themultiple regression model showed that combined dosage rates of the twoBDMs can be used to adequately estimate the performance grade for theasphalt. The model estimations will assist in streamlining the use ofsimilar biomaterials into VTB. Using the binder performance results,statistical modeling was done to optimize formulations to achieve a PG70-22 and a PG 64-22. The measured viscosity results were used in acost-benefits analysis of the control VTB and rejuvenated VTB at PG70-22 and PG 64-22, reductions in energy consumption, and greenhouse gasemissions (CO₂, NO_(X), SO_(X), and CO) were seen.

Aging included both rolling thin film oven (“RTFO”) and pressure agingvessel (“PAV”) aging which simulate short and long-term aging of theasphalt, respectively. Mass loss of the binder was measured after RTFOtesting. All binder testing followed AASHTO M320. The binder specificgravity results showed minor changes when the vegetable (linseed) oilderivatives were added in dosage level combinations from 0.5% to 10%.Mass loss was the lowest with the control group. However, the mass lossfor all the dosage combinations still met the mass loss criteria of 1%or less. Rotational viscosity tests show that as the dosage levelcombination increased the viscosity decreased significantly. Separationtesting was performed and test results show no statistical evidence ofseparation in the groups with dosage level combinations: 4% HBL+4% PHBL,5% HBL+5% PHBL, 2% HBL+6% PHBL, and 6% HBL+2% PHBL. Material evaluationincluded high temperature evaluation in a DSR using short-term agedbinder as well as low temperature evaluation in the bending beamrheometer (“BBR”) using long-term aged binder. The blended materialsachieved a performance grade of 70-22 and a performance grade of 64-22,both of which are typical grades used in the United States and representan improvement for broader use than the original performance grade76-10.

Linseed oil based bio-derived materials (“BDMs”) improve the lowtemperature performance of the stiff VTB compared to softer paving gradeasphalts through rejuvenation. Mix performance of VTB modified with BDMused as rejuvenators at low and intermediate temperatures is examinedand compared against the performance of a VTB control group, and VTBmodified with a commercially available rejuvenator using thesemi-circular bend (“SCB”) test and the dynamic modulus test at low andintermediate temperatures. Findings show that heat bodied linseed oil(“HBO” or “HBL”) and partially hydrogenated heat bodied linseed oil(“PHBO” or “PHBL”) combined make for a successful rejuvenator of VTB. 5%HBO and 5% PHBO combined perform equally and better than the commercialrejuvenator and better than the VTB control group by lowering stiffnessand increasing fracture energy at low temperature, while performing thesame at intermediate temperatures. In particular, BDM from linseed oilwas used to modify VTB to obtain asphalt properties optimal for paving.BDMs are used in several combinations to optimally reduce VTB stiffness.Material evaluation was performed at high and low in-service pavementtemperatures using a dynamic shear rheometer (“DSR”) and bending beamrheometer (“BBR”), respectively. Prior to DSR testing, the VTB-BTMmaterial is aged in a rolling thin film oven (“RTFO”) to simulate agingthat occurs during construction. Similarly, prior to BBR testing, theVTB-BDM material undergoes long-term aging in a pressure-aging vessel tosimulate material properties 7-10 years post-construction. Theun-modified VTB material has a penetration grade of 20-30 and aperformance grade (“PG”) of 76-10. To achieve the objectives, VTB areused in combination with BDMs and the results are analyzed using amultiple regression model to help quantify the economic benefit of usingthe bio-materials. The developed model can assist in the incorporationof bio-materials into VTB formulations.

Bio-derived materials (“BDMs”) from linseed oil have been shown to be asofter material that can add value to very stiff VTB. The objective ofthe present invention is to modify performance of VTB modified with BDMfrom linseed oil used as rejuvenators at low and intermediatetemperatures and compare the performance against that of a controlgroup, and VTB modified with a commercially available rejuvenator.Testing methods used were the semi-circular bend (“SCB”) test and thedynamic modulus test at low and intermediate temperatures.

BRIEF DESCRIPTION OF THE DRAWINGS

FIG. 1 shows the average critical high temperature of three tested RTFODSR specimens for each of the eighteen BDM combination groups.

FIG. 2 shows high temperature residual comparison of the three finalmodels.

FIG. 3 shows example cases of predicted G*/Sin(δ) using a best fitmodel.

FIG. 4 shows critical low temperatures for all tested BDM combinations.

FIG. 5 depicts a low temperature residual comparison of three finalmodels.

FIG. 6 shows example cases of predicted m-value using a best fit model.

FIG. 7 depicts a half-gaussian Normal Distribution around −22° C.

FIG. 8 illustrates a determination of optimum dosage levels for variousperformance grades (PG).

FIG. 9 shows mixing and compaction temperature range examples for testedcombinations.

FIG. 10 shows mix design gradation for tested combinations.

FIGS. 11A-11B show fuel quantities used (FIG. 11A) and prices to produce1 tonne of mix (FIG. 11B).

FIGS. 12A-12D depict emissions from production of 1 tonne of mix CO₂(FIG. 12A), NO_(x) (FIG. 12B), So_(x) (FIG. 12C), and CO (FIG. 12D).

FIGS. 13A-13B show |E*| master curves for temperature (FIG. 13A) andreduced frequency (FIG. 13B).

FIG. 14 shows measured E* data used in statistical analysis for each ofthe five test groups.

FIG. 15 shows average fracture energy (G_(f)) results (computed using atleast three test specimens) at −12° C. for each test group.

FIG. 16 shows results of a student's t least square means differences ofG_(f) results. Levels not connected by same letter are significantlydifferent.

FIG. 17 shows an FTIR absorbance spectra of HBL and PHBL.

FIGS. 18A-18B show a representation of the molecular structure of HBLand PHBL along with the corresponding nuclei's NMR shift prediction ofHBL (FIG. 18A) and PHB (FIG. 18B).

FIG. 19 shows the superimposed NMR of the HBL and PHBL samples, wherethe signal corresponding to the hydrogens in the carbon-carbon doublebonds (5.38 ppm), the hydrogens before and after the carbon-carbondouble bond (2.16 ppm) and the hydrogens between two carbon-carbondouble bonds (2.80 ppm) decrease when comparing HBL to PHB.

FIG. 20 is a size exclusion chromatography graph comparing HBL and PHBLsamples.

FIG. 21 depicts results of separation testing for 4% HBL+4% PHBL.

FIG. 22 depicts results of separation testing for 5% HBL+5% PHBL.

FIG. 23 depicts results of separation testing for 2% HBL+6% PHBL.

FIG. 24 depicts results of separation testing for 6% HBL+2% PHBL.

FIGS. 25A-25B shows average unaged |G_(b)*| (FIG. 25A) and averageunaged δ master curves (FIG. 25B).

FIG. 26 shows average black space diagrams.

FIGS. 27A-27B depicts average short-term aged |G_(b)*| (FIG. 27A) andaverage short-term aged δ master curves (FIG. 27B).

FIG. 28A-28B shows a comparison of unaged and short-term aged mastercurves for 3% HPB)+3% PHBO (FIG. 28A) and 6% CM (FIG. 28B).

FIG. 29 shows average short-term aged black space diagrams.

FIGS. 30A-30B show average long-term aged |G_(b)*| (FIG. 30A) andaverage long-term aged δ master curves (FIG. 30B).

FIG. 31 depicts average long-term aged black space diagrams.

FIG. 32 represents a least square means plot by group name for phaseangle (δ, °).

FIG. 33 depicts δ least square means plot for interaction group by age.

FIG. 34 shows a δ least square means plot for interaction group name bytemperature.

FIG. 35 is a distribution comparison for groups at different stages ofaging using unmodified data.

FIG. 36 is a distribution comparison for groups at different stages ofaging using log10 transformed data.

FIG. 37 depicts a least square means plot by group name for log10|G_(b)*I.

FIG. 38 is a log10 |G_(b)*| least square means plot for interactiongroup name by age.

FIG. 39 depicts a log10 |G_(b)*| least square means plot for interactiongroup name by temperature.

DETAILED DESCRIPTION OF THE INVENTION

One aspect of the present invention relates to an asphalt product. Theasphalt product includes an asphalt binder and a bio-oil blendcomprising a mixture of a non-hydrogenated bio-oil and a partiallyhydrogenated bio-oil, where the bio-oil blend is mixed with the asphaltbinder to form an asphalt product having a shear stiffness of 0.20 kPato 11,000 kPa at a temperature ranging from 25° C. to 85° C. and/or aviscosity of 0.15 Pa·s to 1.50 Pa·s at a temperature ranging from 120°C. to 165° C.

One route to convert lignocellulosic biomass to produce chemicals andfuels that has gained serious attention more recently is a fastpyrolysis platform. Fast pyrolysis is the rapid thermal decomposition oforganic compounds in the absence of oxygen to produce liquids, gases,and chars. The distribution of products depends on the biomasscomposition, particle size, and rate and duration of heating. Liquidyields as high as 78% are possible. The liquid product can substitutefor fuel oil in static heating or electricity generation application. Inaddition, the liquid can also be used to produce a range of specialtyand commodity chemicals, such as levoglucosene, fertilizers, andhydrogen. Depending on its original lignocellulosic biomass source,bio-oil contains between 10 to 30% lignin by weight.

In the fast pyrolysis process, biomass is heated rapidly in a hightemperature environment, yielding a mix of liquid fuel (bio-oil),combustible gases, and solid char. Pyrolysis is an independentconversion technology, as well as a part of the gasification process.Gasification can be separated into two main stages: 1) soliddevolatilization (pyrolysis) and 2) char conversion (combustion andgasification). Fast pyrolysis converts biomass into liquid form, whichhas higher bulk density and heating value. Thus, it is easier and moreeconomical to store and/or transport compared to the bulky biomass. Theliquid product resulting from biomass pyrolysis is commonly referred toas “pyrolysis oil,” “bio-fuel oil,” or simply “bio-oil.”

Bio-oil is a dark-brown, mobile liquid derived from the thermo-chemicalprocessing of biomass. Bio-oils generally contain water and lignin.Lignin is a highly-available, well-studied bio-polymer known for itsantioxidant properties. For asphalt pavements, oxidation can causedeterioration via long-term aging and eventually result in cracking. Thepresent invention relates to lignin-containing bio-oil as an antioxidantadditive for utilization in asphalt binders, and optimization of thebio-oil formulation by adding other additives. Using bio-oil as anantioxidant in asphalt production represents an economical alternativeto conventional methods while being conscious of the environment andincreasing the longevity and performance of asphalt pavements. As apavement ages, it becomes stiffener and more susceptible to failure. Theuse of bio-oil as an asphalt additive is an attractive way to increasethe longevity and enhance the performance of asphalt pavements.

Asphalt includes material in which the predominating constituents arebitumens, which occur in nature or are obtained in petroleum processing.Bitumens include solid, semisolid, or viscous substances, natural ormanufactured, composed principally of high molecular weighthydrocarbons. The asphalt used in the present invention is notparticularly limited, and various kinds of asphalts may be used.Examples of the asphalt include straight asphalts such as petroleumasphalts for pavements, as well as polymer-modified asphalts produced bymodifying asphalt with a polymer material including a thermoplasticelastomer such as styrene/butadiene block copolymers (“SBS”),styrene/isoprene block copolymers (“SIS”), and ethylene/vinyl acetatecopolymers (“EVA”), as further described below.

In one embodiment of the present invention, bio-oil formulated as anasphalt binder can include asphalt. Suitable grades of asphalt includethe following: PG52-22, PG58-22, PG64-22, PG67-22, PG70-22, PG76-22,PG82-22, PG52-28, PG58-28, PG64-28, PG67-28, PG70-28, PG76-28, PG52-34,PG58-34, PG64-34, PG64-16, PG67-16, PG70-16, PG76-16, PG64-10, PG67-10,PG70-10, PG76-10, pen grade 40-50, pen grade 60-70, pen grade 85-100,pen grade 120-150, AR4000, AR8000, AC10 grade, AC20 grade, and AC30grade. F. Roberts et al., “Hot Mix Asphalt Materials, Mixture Design,and Construction,” NAPA Research and Education Foundation (2nd ed.)(1996), which is hereby incorporated by reference in its entirety.

The residuum of the vacuum distillation process, vacuum towerdistillation bottoms (“VTB”), is a very stiff form of asphalt producedfrom through vacuum tower distillation processing in petroleumrefineries (e.g., coking) and has limited use alone for paving. VTB isvery stiff due to the loss of saturates from the coking process toproduce more lighter components. VTB is used to increase production ofhigher economic value lighter components such as gasoline and jet fuel.Due to the loss of saturates from this process, VTB are very stiff andare heavily limited for use in paving.

In one embodiment of the present invention, the binder is a vacuum towerdistillation bottom or vacuum tower bottom. Such vacuum towerdistillation and vacuum tower bottoms are known to those skilled in theart.

Preferably, the asphalt product contains up to about 40% by weightbio-oil blend, up to about 50% by weight bio-oil blend, up to about 60%by weight bio-oil blend, up to about 70% by weight bio-oil blend, up toabout 80% by weight bio-oil blend, up to about 90% by weight bio-oilblend, or up to 99% by weight bio-oil blend. The asphalt mayalternatively contain from about 3% to about 40% by weight bio-oilblend. In one embodiment, the asphalt binder may contain about 3%, about6%, about 9%, about 10%, about 15%, about 25%, about 30%, about 30%, orabout 40% by weight bio-oil blend. Bio-oil, when mixed with asphalt andheated to a temperature of from about 120° C. to about 170° C.,polymerizes with the asphalt, as furfural and phenol compounds in thebio-oil chemically react and form a polymer in the asphalt binder. Inone embodiment, the bio-oil blend comprises 0.1 to 10.0 wt. % of theasphalt product. In another embodiment, the bio-oil blend comprises 6.0to 10.0 wt. % of the asphalt product.

The bio-oil of the present invention may be from an oil derived from asource selected from the group consisting of fish, animal, vegetable,synthetic and genetically-modified plant oils, and mixtures thereof.Renewable source derived fats and oils include algal oil, animal fat,beef tallow, borneo tallow, butterfat, camelina oil, candlefish oil,canola oil, castor oil, cocoa butter, cocoa butter substitutes, coconutoil, cod-liver oil, colza oil, coriander oil, corn oil, cottonseed oil,false flax oil, flax oil, float grease from wastewater treatmentfacilities, hazelnut oil, hempseed oil, herring oil, illipe fat,jatropha oil, kokum butter, lanolin, lard, linseed oil, mango kerneloil, marine oil, meadowfoam oil, menhaden oil, microbial oil, milk fat,mowrah fat, mustard oil, mutton tallow, neat's foot oil, olive oil,orange roughy oil, palm oil, palm kernel oil, palm kernel olein, palmkernel stearin, palm olein, palm stearin, peanut oil, phulwara butter,pile herd oil, pork lard, radish oil, ramtil oil, rapeseed oil, ricebran oil, safflower oil, sal fat, salicornia oil, sardine oil, sasanquaoil, sesame oil, shea fat, shea butter, soybean oil, sunflower seed oil,tall oil, tallow, tigernut oil, tsubaki oil, tung oil, triacylglycerols,triolein, used cooking oil, vegetable oil, walnut oil, whale oil, whitegrease, yellow grease, and derivatives, conjugated derivatives,genetically-modified derivatives, and mixtures of any thereof. Thebio-oil from plant or animal oil of the present invention may bepolymerized. The polymerized plant oil or animal oil can be subsequentlypartially or fully saturated via a catalytic hydrogenationpost-polymerization. The monomeric oils used in the epoxidized fattyacid esters can be any triglycerides or triglyceride mixtures that areradically polymerizable. These triglycerides or triglyceride mixturesare typically plant oils. The bio-oil blend of the present invention maybe modified or unmodified, partially or fully epoxidized, or partially,fully, or non-hydrogenated. In one embodiment, the bio-oil blend ismethylated and/or hydrogenated.

The bio-oil blend of the present invention may be derived from avegetable source such as high erucic acid rapeseed, soybean, safflower,canola, castor, sunflower, palm, and linseed. In particular, suitableplant oils may include a variety of vegetable oils such as butterfat,cocoa butter, cocoa butter substitutes, illipe fat, kokum butter, milkfat, mowrah fat, phulwara butter, sal fat, shea fat, borneo tallow,lard, lanolin, beef tallow, mutton tallow, tallow, animal fat, camelinaoil, canola oil, castor oil, coconut oil, colza oil, coriander oil, cornoil, cottonseed oil, flax seed oil, false flax oil, hazelnut oil,hempseed oil, jatropha oil, linseed oil, mango kernel oil, meadowfoamoil, mustard oil, neat's foot oil, olive oil, palm oil, palm oil, peanutoil, ramtil oil, rapeseed oil, rice bran oil, safflower oil, salicorniaoil, sasanqua oil, sesame oil, shea butter, soybean oil, sunflower seedoil, tall oil, tigernut oil, tsubaki oil, tung oil, vegetable oils,marine oils, menhaden oil, candlefish oil, cod-liver oil, orange roughyoil, pile herd oil, sardine oil, walnut oil, whale oils, herring oils,triacylglycerols, diacylglycerols, monoacylglycerols, triolein, palmolein, palm stearin, palm kernel olein, palm kernel stearin,triacylglycerols of medium chain fatty acids, and derivatives,conjugated derivatives, genetically-modified derivatives and mixturesthereof. According to certain embodiments of the hot melt adhesive,where the hydrogenated polymerized oil is a partially hydrogenatedpolymerized oil, the partially hydrogenated polymerized oil in thebinder may undergo an oxidative curing. In a preferred embodiment, thebio-oil is linseed oil.

In another embodiment, the composition further comprises one or morenon-hydrogenated, hydrogenated, or partially hydrogenated vegetableoils. The one or more hydrogenated vegetable oils are derived from agroup of vegetable oils consisting of high erucic acid rapeseed,soybean, safflower, canola, castor, sunflower and linseed oils. In oneembodiment, the hydrogenated vegetable oil is derived from high erucicacid rapeseed, soy or castor oil and the hydrogenated polymerized oil isderived from linseed oil. In this embodiment, the non-hydrogenated,hydrogenated, or partially hydrogenated vegetable oils and the vegetableoil are respectively present in a range of ratios where the finalproduct has the desired properties. Such properties may be affected bythe relative ratios of the above ingredients and can vary depending onthe composition's end-use.

Heat polymerized oils, often referred to as heat bodied oils, areprepared from unsaturated oils. Linseed, safflower and soybean oils arecommonly used as the starting materials for this process. In addition,fish oils are commonly heat polymerized. Depending on the oil used, thetemperature is held between about 288° C. to about 316° C. until aproduct with a desired viscosity is obtained. Longer reaction times areused to reach a higher viscosity product. The viscosity of polymerizedoils is described using a scale with values ranging from P to Z₉. Duringthe heat-polymerization reaction, the unsaturated triacylglycerols reactto form polymers. As polymerization takes place, new carbon-carbon bondsare formed between triacylglycerol units at sites occupied by doublebonds in the original triacylglycerols. Ester bonds between glycerol andfatty acids in the original triacylglycerols remain intact.

The product of the present aspect may be a semi-solid or wax-likematerial. The state of the composition will depend on the degree ofhydrogenation. The hardness or softness of the material may be a resultof the level of hydrogenation. Thus, when a material having a differentconsistency is desired, the oil(s) comprising the composition may behydrogenated fully or partially to yield the desired consistency.Depending on the material's hardness or softness preferred, the oil(s)comprising the composition may be hydrogenated to the extent desired.The term “hydrogenated” thus encompasses varying degrees of partial andfull hydrogenation. See U.S. Pat. No. 7,951,862 to Bloom et al., whichis hereby incorporated by reference in its entirety.

In one embodiment, the bio-oil blend is a mixture of heat-bodied linseedoil (“HBL”) and partially hydrogenated heat-bodied linseed oil (“PHBL”).More particularly, the asphalt product, in one embodiment, may have anHBL concentration of 0.5%-6.0% and a PHBL concentration of 0.5%-6.0%. Inanother embodiment, the asphalt product may have an HBL concentration of3.0%-5.0% and a PHBL concentration of 3.0%-5.0%. For example the HBL andPHBL concentrations may be 0.5%, 1.0%, 1.5%, 2.0%, 2.5%, 3.0%, 3.5%,4.0%, 4.5%, 5.0%, 5.5%, and 6.0%.

The linseed oil is a heat-bodied linseed oil (“HBL”) and, in differentembodiment, the linseed oil is a partially hydrogenated heat-bodiedlinseed oil (“PHBL”). The asphalt product may have an HBL concentrationof 0.5%-3.0% or a PHBL concentration of 0.5%-3.0%. For example the HBLconcentration may be 0.5%, 1.0%, 1.5%, 2.0%, 2.5%, and 3.0% or,alternatively, the PHBL concentration may be 0.5%, 1.0%, 1.5%, 2.0%,2.5%, and 3.0%.

In another embodiment, the composition may include a hydrogenatedpolymerized oil that further includes a fatty acid ester of triglycerol(triglycerol: CA number 56090-54-1). The fatty acid ester of triglycerolcan be a mono-, di-, tri-, tetra-, or penta-ester. In still otherembodiments, the fatty acid ester is behenic acid ester. Such esters canbe added to modify the micro-crystallinity of wax-like solids orotherwise enhance the desired physical characteristics describe above.See U.S. Pat. No. 7,951,862 to Bloom et al., which is herebyincorporated by reference in its entirety.

In another embodiment, the mixture of non-hydrogenated bio-oil andpartially hydrogenated oil further comprises a fatty acid ester oftriglycerol and a refined, bleached and deodorized (“RBD”) vegetableoil. In such a composition, it may be desirable that the mixture ofnon-hydrogenated bio-oil and partially hydrogenated oil, the RBDvegetable oil and the fatty acid ester are respectively present in arange of ratios where the final product has the desired properties. Suchproperties may be affected by the relative ratios of the aboveingredients and can vary depending on the composition's end-use, whichare described herein. In certain embodiments, the RBD oil is selectedfrom the group of vegetable oils consisting of high erucic acidrapeseed, soybean, safflower, canola, castor, sunflower and linseedoils. In another embodiment, the hydrogenated polymerized oil is derivedfrom soy oil, the RBD oil is soy oil, and the fatty acid ester isbehenic acid ester. In any of these embodiments, the ratios ofnon-hydrogenated bio-oil and partially hydrogenated oil to RBD vegetableoil to fatty acid ester can be modified to yield the desired productconsistency in accord with the final disposition of the product. Therespective amount of any of the above primary ingredients can beadjusted from between about 1% to about 99% of the composition. See U.S.Pat. No. 7,951,862 to Bloom et al., which is hereby incorporated byreference in its entirety.

In yet another embodiment, the one or more vegetable oils describedabove are blended to form a first oil mixture, which is then admixedwith the mixture of non-hydrogenated bio-oil and partially hydrogenatedoil. The first oil mixture can be admixed with the mixture ofnon-hydrogenated bio-oil and partially hydrogenated oil at a ratio ofbetween about 1:1 to about 1:100 first oil mixture to mixture ofnon-hydrogenated bio-oil and partially hydrogenated oil. The ratio canbe adjusted accordingly to suit the desired end-use of the compositionor as needed for any reason. In certain embodiments, the first oilmixture is a blend of heat-bodied linseed oil and partially hydrogenatedheat-bodied linseed oil. The ratio forms a blend that is useful as acrystal modifier, but the ratio can be adjusted accordingly to suit thedesired end-use of the composition or as needed for any reason. Such afirst oil mixture can be added to any hydrogenated polymerized oil at aratio described above. See, e.g., U.S. Pat. No. 7,951,862 to Bloom etal., which is hereby incorporated by reference in its entirety.

The composition comprising a mixture of non-hydrogenated bio-oil andpartially hydrogenated oil can further include a fatty acid ester oftriglycerol. The hydrogenated vegetable oil(s) can be blended with saidfatty acid ester of triglycerol at a ratio of between about 1:1 to about100:1 hydrogenated vegetable oil(s) to said fatty acid ester to form afirst blend. The ratio of oil and ester in the first blend can beadjusted accordingly to suit the desired end-use of the composition oras needed for any reason. The first blend can be admixed with thehydrogenated polymerized oil at a ratio of between about 1:1 to about100:1 hydrogenated polymerized oil to said first blend to form thecomposition. In this embodiment, the hydrogenated polymerized oil, oneor more hydrogenated vegetable oils and the fatty acid ester arerespectively present in a range of ratios where the final product hasthe desired properties. Such properties may be affected by the relativeratios of the above ingredients and can vary depending on thecomposition's end-use, which are described above. In one embodiment, thehydrogenated polymerized oil is derived from linseed or soy oil; thehydrogenated vegetable oil is derived from soy oil; and the fatty acidester is a behenic acid ester. See U.S. Pat. No. 7,951,862 to Bloom etal., which is hereby incorporated by reference in its entirety.

According to other embodiments, the partially hydrogenated polymerizedoils of the present disclosure may be interesterified withtriacylglycerol oils, for example, vegetable oils, which may benon-hydrogenated, partially hydrogenated, and fully hydrogenated. Asused herein, the terms “interesterified” and “interesterification” referto a chemical reaction in which the ester functional groups in the twoor more components exchange the acyl portion of the at least one of theesters of triacylglycerols in vegetable oils (including hydrogenated andpolymerized vegetable oils), as shown in equation 1. See U.S. Pat. No.7,951,862 to Bloom et al., which is hereby incorporated by reference inits entirety.

For example, the hydrogenated heat-bodied or polymerized oils of thepresent disclosure may be interesterified with hydrogenated HEAR oil toproduce a composition having a high monoester content. Suitableprocedures for interesterification include, but are not limited to,those described in U.S. Pat. No. 2,442,531 to Eckey, U.S. Pat. No.2,442,532 to Eckey, and U.S. Pat. No. 6,723,863 to Lee et al., each ofwhich is hereby incorporated by reference its entirety, includingenzymatic interesterification, acid mediated interesterification, andbase mediated interesterification. According to certain embodiments,interesterification of the partially hydrogenated heat-bodied orpolymerized oil with other vegetable oils, such as hydrogenated HEAR oilmay be used to produce a microcrystalline wax material. Themicrocrystalline wax material may be composed of primarily bio-basedproducts. See U.S. Pat. No. 7,951,862 to Bloom et al., which is herebyincorporated by reference in its entirety.

According to other embodiments, one or more carbon-carbon double bondsin the molecular structure of the polymerized oils and partiallyhydrogenated polymerized oils of the present invention may be subjectedto epoxidation. Epoxidation, either by a chemical epoxidation or anenzymatic epoxidation, converts the one or more carbon-carbon doublebonds on the polymerized oil to an epoxide. According to variousembodiments, at least one up to all of the remaining carbon-carbondouble bonds of the polymerized oil may be converted to epoxides. Theresulting epoxy systems may react with nucleophiles, such asamines/polyamides and hydroxyls. In other embodiments, the epoxidizedpolymerized oils may be used as acid scavengers (such as HCl scavengers)or as plasticizers, lubricants, or additives in PVC or other plasticcompounding application. See U.S. Pat. No. 7,951,862 to Bloom et al.,which is hereby incorporated by reference in its entirety. Thepolymerized oils described herein may contain one or more epoxide(oxirane) rings, and unless specified otherwise, it is intended that thecompounds include both cis- or trans-isomers and mixtures thereof. Whenthe polymerized oils described herein contain olefinic double bonds orother centers of geometric asymmetry, and unless specified otherwise, itis intended that the compounds include both E and Z geometric isomers.

The fracture energy of the asphalt product described herein may, in oneembodiment, be between 5% to 100% greater than that of an asphaltproduct without the bio-oil blend. For example, the fracture energy maybe 5%, 10%, 15%, 20%, 25%, 30%, 35%, 40%, 45%, 50%, 55%, 60%, 65%, 70%,75%, 80%, 85%, 90%, 95%, or even 100% greater than when the bio-oilblend is not present in the asphalt material. A semi-circular bend(“SCB”) test carried out in accordance with AASHTO TP 105-13 is onemethod for determining fracture energy and may be used herein. See Chonget al., “New Specimen for Fracture Toughness Determination for Rock andOther Materials,” International Journal of Fracture 26(2): R59-R62(1984); Semi-Circular Bending Test: A Practical Crack Growth Test UsingAsphalt Concrete Cores. RILEM PROCEEDINGS, CHAPMAN & HALL (1996); Li etal., “Using Semi Circular Bending Test to Evaluate Low TemperatureFracture Resistance for Asphalt Concrete,” Experimental Mechanics50(7):867-76 (2010); Li et al., “Evaluation of the Low TemperatureFracture Resistance of Asphalt Mixtures Using the Semi Circular BendTest (with Discussion),” Journal of the Association of Asphalt PavingTechnologists 73 (2004); Lim et al., “Stress Intensity Factors forSemi-Circular Specimens under Three-Point Bending,” Engineering FractureMechanics 44(3):363-82 (1993); Marasteanu et al., “National Pooled FundStudy—Phase Ii: Final Report—Investigations of Low Temperature Crackingin Asphalt Pavements,” MN/RC 2012-23, (2012); Low Temperature FractureTest for Asphalt Mixtures. Fifth International RILEM Conference onReflective Cracking in Pavements (2004) RILEM Publications SARL; andTeshale et al., “Low-Temperature Fracture Behavior of Asphalt Concretein Semi-Circular Bend Test,” University of Minnesota (2012), all ofwhich are hereby incorporated by reference in their entirety.

The stiffness of the asphalt product of the present aspect may bebetween 5% to 100% less than that of an asphalt material without thebio-oil blend. For example, the stiffness may be 5%, 10%, 15%, 20%, 25%,30%, 35%, 40%, 45%, 50%, 55%, 60%, 65%, 70%, 75%, 80%, 85%, 90%, 95%, oreven 100% less than when the bio-oil blend is absent from the asphaltproduct. A semi-circular bend (“SCB”) test carried out in accordancewith AASHTO TP 105-13 is one method for determining stiffness and may beused herein.

For example, the asphalt binder, when combined with the bio-oil blend,may produce a shear stiffness of 0.20 kPa to 11,000 kPa at a temperatureranging from 25° C. to 85° C. For example, the shear stiffness at atemperature ranging from 25° C. to 85° C. may be up 0.20 kPa; between0.20 kPa and 11,000 kPa; between 0.50 kPa and 11,000 kPa; between 1.00kPa and 11,000 kPa; between 1.50 kPa and 11,000 kPa; between 2.00 kPaand 11,000 kPa; between 2.50 kPa and 11,000 kPa; between 3.00 kPa and11,000 kPa; between 3.50 kPa and 11,000 kPa; between 4.00 kPa and 11,000kPa; between 4.50 kPa and 11,000 kPa; between 5.00 kPa and 11,000 kPa;between 5.50 kPa and 11,000 kPa; between 6.00 kPa and 11,000 kPa;between 6.50 kPa and 11,000 kPa; between 7.00 kPa and 11,000 kPa;between 7.50 kPa and 11,000 kPa; between 8.00 kPa and 11,000 kPa;between 8.50 kPa and 11,000 kPa; between 9.00 kPa and 11,000 kPa;between 9.50 kPa and 11,000 kPa; between 10.00 kPa and 11,000 kPa;between 25.00 kPa and 11,000 kPa; between 50.00 kPa and 11,000 kPa;between 100.00 kPa and 11,000 kPa; between 200.00 kPa and 11,000 kPa;between 300.00 kPa and 11,000 kPa; between 400.00 kPa and 11,000 kPa;between 500.00 kPa and 11,000 kPa; between 1,000 kPa and 11,000 kPa;between 2,500 kPa and 11,000 kPa; between 5,000 kPa and 11,000 kPa;between 7,500 kPa and 11,000 kPa; and between 10,000 kPa and 11,000 kPa.The temperature may be, for example, 25° C.; between 25° C. and 85° C.;between 30° C. and 85° C.; between 35° C. and 85° C.; between 40° C. and85° C.; between 45° C. and 85° C.; between 50° C. and 85° C.; between55° C. and 85° C.; between 60° C. and 85° C.; between 65° C. and 85° C.;between 70° C. and 85° C.; between 75° C. and 85° C.; between 80° C. and85° C.; and 85° C. For example, in one embodiment, the asphalt producthas a shear stiffness of 0.20 kPa to 11,000 kPa at a temperature rangingfrom 25° C. to 85° C. and a viscosity of 0.15 Pa·s to 1.50 Pa·s at atemperature ranging from 120° C. to 165° C. In another embodiment, theasphalt product has a shear stiffness for an unaged binder ranging from0.21 kPa to 7.45 kPa at a temperature ranging from 64° C. to 82° C. Inyet another embodiment, the asphalt product has a shear stiffness for ashort term aged binder ranging from 0.45 kPa to 23.25 kPa at atemperature ranging from 64° C. to 82° C. Alternatively, in anotherembodiment, the asphalt product may have a shear stiffness for a longterm aged binder ranging from 659.04 kPa to 10,883.63 kPa at atemperature ranging from 31° C. to 40° C.

The asphalt product of the present aspect may have a viscosity ofbetween 0.15 Pa·s to 1.50 Pa·s at a temperature ranging from 120° C. to165° C. For example, the viscosity at a temperature ranging from 120° C.to 165° C. may be 0.15 Pa·s, up to 0.20 Pa·s, between 0.15 and 0.2 Pa·s;between 0.15 and 0.3 Pa·s; between 0.15 and 0.4 Pa·s; between 0.15 and0.5 Pa·s; between 0.15 and 0.6 Pa·s; between 0.15 and 0.7 Pa·s; between0.15 and 0.8 Pa·s; between 0.15 and 0.9 Pa·s; between 0.15 and 1.0 Pa·s;between 0.15 and 1.1 Pa·s; between 0.15 and 1.2 Pa·s; between 0.15 and1.3 Pa·s; between 0.15 and 1.4 Pa·s; and between 0.15 and 1.5 Pa·s. Thetemperature may be, for example, 120° C., between 120° C. and 140° C.,between 120° C. and 150° C., between 120° C. and 160° C., or between120° C. and 165° C. In one embodiment, the asphalt product has aviscosity of 0.18 Pa·s to 1.35 Pa·s at a temperature ranging from 135°C. to 165° C. In another embodiment, the asphalt product has a viscosityof 0.6469 Pa·s to 1.33 Pa·s at a temperature of 135° C. In yet anotherembodiment, the asphalt product has a viscosity of 0.3244 Pa·s to 0.5435Pa·s at a temperature of 150° C. Alternatively, in another embodiment,the asphalt product has a viscosity of 0.1808 Pa·s to 0.2825 Pa·s at atemperature of 165° C.

In one embodiment, the product has a specific gravity of between1.019-1.052. For example, the specific gravity may be, but is notlimited to, 1.019, 1.020, 1.025, 1.030, 1.035, 1.040, 1.045, 1.050, and1.052.

In one embodiment, the asphalt product further includes a mineralaggregate. A mineral aggregate may be added to the asphalt product tomodify its rheology and temperature susceptibility. The bio-oil blendmay bind to the mineral aggregate at an air void content of from about1% to about 50% according to procedures known to one of skill in theart. The mineral aggregate may include, but is not limited to, sand,gravel, limestone, quartzite, crushed stone, slag, and mixtures thereof.The mineral aggregate particles of the present invention can includecalcium based aggregates, for example, limestone, siliceous basedaggregates and mixtures thereof. Aggregates can be selected for asphaltpaving applications based on a number of criteria, including physicalproperties, compatibility with the bitumen to be used in theconstruction process, availability, and ability to provide a finishedpavement that meets the performance specifications of the pavement layerfor the traffic projected over the design life of the project. Theproduct may be free of deletrious materials such as those within anaggregate stockpile that are weak, reactive, or unsound as well as freeof substantial voids within the aggregate.

In one embodiment, the product is in the form of asphalt concrete usedin pavement. In another embodiment, the asphalt product is in the formof an asphalt mixture. The asphalt mixture may further includefiberglass and a mineral aggregate including at least one of lime dustand granular ceramic material. Mineral aggregates of the presentinvention may include elements of less than 0.063 mm and optionallyaggregates originating from recycled materials, sand with grain sizesbetween 0.063 mm and 2 mm and optionally grit, containing grains of asize greater than 2 mm, and optionally alumino-silicates.Aluminosilicates are inorganic compounds based on aluminium and sodiumsilicates or other metal such as potassium or calcium silicates.Aluminosilicates reduce the viscosity of the warm-mix and are in theform of a powder and/or granulates. The term granulates refers tomineral and/or synthetic granulates, especially coated materialaggregates, which are conventionally added to bituminous binders formaking mixtures of materials for road construction.

In another embodiment, the asphalt product is used in roofing shingles.For a roofing-grade asphalt product, roofing granules can be applied toa surface of a coated base material. The roofing granules can be usedfor ultraviolet radiation protection, coloration, impact resistance,fire resistance, another suitable purpose, or any combination thereof.The roofing granules may include inert base particles that are durable,inert inorganic mineral particles, such as andesite, boehmite, coalslag, diabase, metabasalt, nephaline syenite, quartzite, rhyodacite,rhyolite, river gravel, mullite-containing granules, another suitableinert material, or any combination thereof. See U.S. Patent Publ. No.2013/0160674 to Hong et al., which is hereby incorporated by referencein its entirety.

Roofing granules may also include one or more surface coatings over theshingle. The surface coating can cover at least approximately 75% of thesurface of the shingle, and may cover at least approximately 90% of thesurface of the shingle and may or may not have a uniform thickness. Ifmore than one surface coating is used, a surface coating closer to theshingle can include a binder that can be inorganic or organic. Aninorganic binder can include a silicate binder, a titanate binder, azirconate binder, an aluminate binder, a phosphate binder, a silicabinder, another suitable inorganic binder, or any combination thereof.An organic binder can include a polymeric compound. In a particularembodiment, an organic binder can include an acrylic latex,polyurethane, polyester, silicone, polyamide, or any combinationthereof. One or more additional organic binders of the same or differentcomposition can be used.

A surface coating may also or alternatively include a solar reflectivematerial that helps to reflect at least some of the solar energy. Forexample, UV radiation can further polymerize or harden the asphaltwithin roofing product being fabricated. A solar reflective material caninclude titanium dioxide, zinc oxide, or the like. Alternatively, thesolar reflective material can include a polymeric material. In oneembodiment, a polymer can include a benzene-modified polymer (e.g.,copolymer including a styrene and an acrylate), a fluoropolymer, or anycombination thereof. Other solar reflective materials are described inU.S. Pat. No. 7,241,500 to Shiao et al. and U.S. Publ. Nos. 2005/0072110to Shiao et al. and 2008/0220167 to Wisniewski et al., all of which areincorporated by reference for their teachings of materials that are usedto reflect radiation (e.g., UV, infrared, etc.) from the sun.

A surface coating can also or alternatively include an algaecide oranother biocide to help reduce or delay the formation of algae oranother organic growth. The algaecide or other biocide can include anorganic or inorganic material. The algaecide or other biocide caninclude a triazine, a carbamate, an amide, an alcohol, a glycol, athiazolin, a sulfate, a chloride, copper, a copper compound, zinc, azinc compound, another suitable biocide, or any combination thereof. Ina particular embodiment, the algaecide or other biocide can be includedwithin a polymeric binder. The polymeric binder can includepolyethylene, another polyolefin, an acid-containing polyolefin,ethylene vinyl acetate, an ethylene-alkyl acrylate copolymer, apolyvinylbutyral, polyamide, a fluoropolymer, an acrylic, amethacrylate, an acrylate, polyurethane, another suitable bindermaterial, or any combination thereof. The algaecide or other biocide canbe an inorganic material that is included within an inorganic binder,for example, within an alkali metal silicate binder. An exemplaryinorganic algaecide or other biocide can include a metal (by itself), ametal oxide, a metal salt, or any combination thereof. The metallicelement used within the metal, metal oxide, or salt may include copper,zinc, silver, or the like. The metal salt can include a metal sulfate, ametal phosphate, or the like.

A surface coating can include a colorant or another material to providea desired optical effect. The colorant or other material can include ametal oxide compound, such as titanium dioxide (white), zinc ferrite(yellow), red iron oxides, chrome oxide (green), and ultramarine (blue),silver oxide (black), zinc oxide (dark green), or the like. In anotherembodiment, the colorant or other material may not be a metal-oxidecompound. For example, the colorant may include carbon black, zinc oraluminum flake, or a metal nitride.

The asphalt product can also include manufactured sand, e.g., crushedand washed mined aggregate, and also a blend of ceramic material andmanufactured sand. Likewise, the product may include modified asphaltcontaining a Fischer-Tropsch wax, polyethylene wax, and/or oxidizedpolyethylene wax. Wax modifiers that can be usefully employed in thecontext of the present invention include, but are not limited to, waxesof vegetable (e.g. carnuba wax), animal (e.g beeswax) mineral (e.g.Montan™ wax from coal, Fischer Tropsch wax from coal) or petroleum (e.g.paraffin wax, polyethylene wax, Fischer-Tropsch wax from gas) originincluding oxidized waxes; amide waxes (e.g. ethylene bis stearamide,stearyl amide, stearyl stearamide); fatty acids and soaps of waxy nature(e.g., aluminum stearate, calcium stearate, fatty acids); other fattymaterials of waxy nature (fatty alcohols, hydrogenated fats, fattyesters etc) with the ability to stiffen asphalt, and the like. The aboveproducts are basically soluble in the asphalt at warm mix temperatures,to make a homogeneous binder, and/or will melt at the temperature of themix and the ingredients will disperse/dissolve into the mixture. The waxand resin ingredients will generally act to improve cohesion propertiesof the asphalt, while the adhesion promoter will improve the adhesion ofthe asphalt to the aggregate. Together the ingredients provide improvedresistance to water damage. The present invention may employ a FischerTropsch Wax derived from coal or natural gas or any petroleum feedstock.The process entails the gasification of the above feedstock by partialoxidation to produce carbon monoxide under high temperature and pressureand reaction of the resultant carbon monoxide with hydrogen under hightemperature and pressure in the presence of a suitable catalyst (such asiron compound or cobalt compound) for example as in the case ofprocesses employed by Shell and Sasol. The congealing point of the waxis between 68° C. and 120° C. with a Brookfield viscosity at 135° C. inthe range of 8 to 20 cPs. For example, the congealing point of the waxmay be between 80° C. and 120° C. Alternatively, the congealing point ofthe wax may be between 68° C. and 105° C. See U.S. Patent Publ. No.2013/0186302 to Naidoo et al., which is hereby incorporated by referencein its entirety.

In an embodiment of the present invention, asphalt binder may becombined with bio-oil blend to form a substantially homogeneous mixture.The homogenous material can be graded according to AASHTO MP3 and usedas an asphalt binder in paving projects.

The asphalt binder modifier can, in one embodiment, include a carboxyladditive. Examples of carboxyl additives include, but are not limitedto, tall oil and vegetable oils, such as linseed oil and soybean oil andthe like. The carboxyl may be added at a concentration of up to about10% by weight of the asphalt binder or, more preferably, the carboxyl isadded at a concentration of from about 0.18% to about 10% by weight ofthe asphalt binder. The bio-oil and tall oil are added to an asphaltbinder at a temperature ranging from about 120° C. to about 170° C.utilizing mechanical agitation/mixing.

The asphalt product may optionally include a polymer additive. Anysuitable polymer or mixture of different polymers can be used inproducing polymer-modified asphalt. The asphalt binder can include, forexample, a polymer additive such as polyethylenes, oxidizedpolyethylenes, polyolefins, PE homopolymers, styrene/butadiene/styrenetriblock copolymer, styrene/ethylene-butylene/styrene triblockcopolymer, epoxy modified acrylate copolymer, ethylene/vinyl acetatecopolymer, or mixtures thereof. The polymer additive can include lowmolecular weight polymers, such as low, medium, or high densitypolyethylenes having a maximum viscosity of 1000 cps at 140° C. Othersuitable polymers would include ethylenes and polypropylenes withmelting points below 140° C. In one embodiment, the binder may furtherinclude a styrene-butadiene type polymer. Styrene-butadiene typepolymers may, in certain embodiments, include SB rubber, SBS lineartype, SBS radial type, and SB sulphur linked type polymers, and thelike. Polymers, such as styrene butadiene polymers, can be used toadjust or manipulate certain characteristics of the resulting hardenedasphalt product. Styrene butadiene modified asphalts may demonstrategreater ability to withstand temperature extremes. For example, styrenebutadiene modified asphalt is more viscous at high temperatures andtherefore resistant to rutting or shoving, and more ductile at lowtemperatures and therefore less brittle, more resistant to fatiguecracking, and provide a more adhesive binder. According to certainembodiments, the binder materials of the present disclosure comprisingthe at least partially hydrogenated polymerized oil may be used as abinder material in asphalt applications. See U.S. Pat. No. 7,951,862 toBloom et al., which is hereby incorporated by reference in its entirety.

The polymer additive in the asphalt binder may be added at aconcentration of up to about 1%, up to about 5%, up to about 10%, up toabout 15%, up to about 20%, up to about 25%, and up to about 50% of theasphalt binder. The polymer additive is added to the bio-oil at atemperature ranging from about 100° C. to about 130° C. utilizingmechanical agitation/mixing.

The asphalt binder may include from about 99% to about 1% by weightasphalt (and when the asphalt contains a polymer-modified asphalt, from0% to about 25% by weight styrene-butadiene type polymer), about 1% toabout 99% by weight bio-oil blend, and optionally from about 0.10% toabout 10% by weight carboxyl bio-oil additive.

In an embodiment, the asphalt binder can be mixed with water and asurfactant and mechanically agitated in, for example, a shear mill, toform an emulsion. Suitable emulsion-forming surfactants are known tothose of skill in the art. The emulsified asphalt binder can be used asweather-proofing sealant or as an adhesive bonding layer between twosurfaces.

Another aspect of the present invention relates to a method of producingan asphalt product. The method includes providing an asphalt binder,where the binder is a vacuum tower distillation bottom; providing abio-oil blend comprising a mixture of a non-hydrogenated bio-oil and apartially hydrogenated bio-oil. The asphalt binder is mixed with thebio-oil blend under conditions effective to produce an improved asphaltproduct having a shear stiffness of 0.20 kPa to 11,000 kPa at atemperature ranging from 25° C. to 85° C. and/or a viscosity of 0.15Pa·s to 1.50 Pa·s at a temperature ranging from 120° C. to 165° C.

The asphalt binder and bio-oil blend of this aspect of the presentinvention are in accordance with the previously described aspects of theinvention. In one embodiment, the asphalt used in carrying out thisaspect of the present invention may be the above described polymermodified asphalt product.

The mixing step may be carried out in a high speed shear mill at atemperature of, for example, 160° C., 159° C., 158° C., 157° C., 156°C., 155° C., 154° C., 153° C., 152° C., 151° C., 150° C., or anytemperature in between. In one embodiment, mixing is carried out in ahigh speed shear mill at 150° C. to 160° C.

Another aspect relates to a method of applying an asphalt product to asurface. The method includes (a) providing an asphalt product, (b)heating the asphalt product to a temperature of 145° C. to 155° C. tocoat the mineral aggregate and produce an asphalt material which hasimproved rheological properties compared to that of an asphalt materialabsent the bio-derived material; (c) applying the heated asphaltmaterial to a surface to be paved to form an applied paving material;and (d) compacting the applied paving material.

The asphalt product, asphalt material, and bio-derived material of thisaspect of the present invention are in accordance with the previouslydescribed aspects of the invention. In one embodiment, the asphalt usedin carrying out this aspect of the present invention may be the abovedescribed polymer modified asphalt product.

The heating step of the present aspect may be carried at a temperatureof, for example, 145° C., 146° C., 147° C., 148° C., 149° C., 150° C.,151° C., 152° C., 153° C., 154° C., 155° C., or any temperature inbetween. In one embodiment, mixing is carried out in a high speed shearmill at 145° C. to 155° C. Whichever temperature is used, it is adequatefor the asphalt product to coat a mineral aggregate including themineral aggregates described above and to produce an asphalt productwith improved rheological properties compared to an asphalt productabsent BDMs.

The asphalt material may be applied to any surface to be paved to forman applied paving material consistent with paving materials andapplications described above. While the surface to be paved is specificto a particular paving environment, other applications of the inventionwill become apparent to those skilled in the art. Accordingly, anapplied paving material should be interpreted broadly to include allvarieties of asphalt, cement, concrete, soil, sand, stones, bituminousmaterial and all other forms of in-place material.

According to the present invention, the asphalt product may have acompaction force index of up to 600 at a temperature ranging from 100°C. to 140° C. The asphalt may alternatively have a compaction forceindex of under 2000 at a temperature ranging from 100° C. to 140° C.Compaction energy may be evaluated through use of a Pine AFG2 gyratorycompactor and may include moment, height, pressure, and angle ofgyration. Abed, A. H., “Enhanced Aggregate-Asphalt Adhesion andStability of Local Hot Mix Asphalt,” Engineering and Technical Journal29(10):2044-59 (2011); DelRio-Prat et al., “Energy Consumption DuringCompaction with a Gyratory Intensive Compactor Tester. EstimationModels,” Construction and Building Materials 25(2): 979-86 (2011);Faheem et al., “Estimating Results of a Proposed Simple Performance Testfor Hot-Mix Asphalt from Superpave Gyratory Compactor Results,”Transportation Research Record: Journal of the Transportation ResearchBoard 1929:104-13 (2005); Mo et al. “Laboratory Investigation ofCompaction Characteristics and Performance of Warm Mix AsphaltContaining Chemical Additives,” Construction and Building Materials37:239-47 (2012); Sanchez-Alonso et al., “Evaluation of Compactabilityand Mechanical Properties of Bituminous Mixes with Warm Additives,”Construction and Building Materials 25(5):2304-1 (2011), all of whichare hereby incorporated by reference in its entirety.

The above disclosure generally describes the present invention. A morespecific description is provided below in the following examples. Theexamples are described solely for the purpose of illustration and arenot intended to limit the scope of the present invention. Changes inform and substitution of equivalents are contemplated as circumstancessuggest or render expedient. Although specific terms have been employedherein, such terms are intended in a descriptive sense and not forpurposes of limitation.

EXAMPLES

The following examples are intended to illustrate, but by no means areintended to limit, the scope of the present invention as set forth inthe appended claims.

Example 1—Materials and Methods

In this research work, one source of vacuum tower bottoms (“VTBs”) froman Illinois refinery was used. VTBs are a very stiff form of asphaltbinder, and typically have a penetration grade of 20-30 and aperformance grade (PG) of PG 76-10. Two bio-derived materials fromlinseed oil were used—Heat Bodied Linseed Oil (“HBL” or “HBO”) andPartially Hydrogenated Heat Bodied Linseed Oil (“PHBL” or “PHBO”)—ataddition rates between 0% and 6% to create a total of eighteencombination groups. The properties for the HBL and PHBL bio-derivedmaterials (“BDMs”) are shown in Table 1.

TABLE 1 Properties of BDMs HBL and PHBL HBL PHBL Physical Form Amberliquid Solid paste Specific Gravity at 1.02 1.05 25° C. (77° F.)Molecular Weight 3,400 3,400 (Mn) [Da] T_(g) [° C.] −17.91 −24.89, 16.25Melting Temp. — 42.92 [° C.] Shear Rate (1/S) Shear Rate (1/S) Viscosity(Pa · S) 50 100 150 50 100 150 at 25° C. (77° F.)  3.57 3.56 3.54 52.642.24 36.35 at 35° C. (95° F.)  2.11 2.09 2.06 27.92 21 17.75 at 45° C.(113° F.) 1.2 1.19 1.18 9.26 7.09 6.23 at 55° C. (131° F.) 0.84 0.82 0.81.19 0.86 0.8 at 65° C. (149° F.) 0.48 0.48 0.47 0.06 0.14 0.16

Example 2—Sample Preparation and Experimental Testing Plan

Sample Preparation—To prepare samples for testing, BDMs were blendedwith the VTB at 155° C.±10° C. at 3000 rpm for one hour using aSilverson shear mill. After all blending combinations were created, thematerials were then short term aged in a Rolling Thin Film Oven (“RTFO”)and material was reserved for Dynamic Shear Rheometer (“DSR”) testing todetermine the high-temperature grade. The remaining material was aged ina pressure aging vessel (“PAV”) for subsequent testing in a BBR fordetermining the low-temperature grade.

The high temperature grade of asphalt is important, because it measuresthe stiffness of the binder at high in-service temperatures. Adequatehigh-temperature binder properties are required to prevent permanentdeformation or rutting. More specifically, the DSR characterizes theviscous and elastic behavior of high and intermediate temperatures forasphalt binders. DSR tests are conducted on unaged (original),short-term aged, and long term aged asphalt binder samples. The workinitially focused on short-term aged binder testing with a DSR toidentify the more viable combinations for subsequent testing andevaluation. Asphalt binders are known to be viscoelastic. This meansthey can experience material behavior like an elastic solid (recoverabledeformation) and a viscous liquid (non-recoverable deformation) due toloading and unloading at the same time. Measurements gained from DSRtesting are a specimen's complex shear modulus (G*) or stiffness andphase angle (δ). The complex shear modulus (G*) or stiffness is ameasure of a specimen's total resistance to deformation, while the phaseangle (δ) is the lag between the applied shear stress and the resultingshear strain experienced by said specimen. As the phase angle nears 90degrees the material is more viscous, but as the phase angle edgescloser to 0 degrees the material acts more elastic. The parameters G*and δ when used together as G*/sin(δ) are used to predict whether anasphalt binder will experience rutting. For short-term aged binder,rutting is the main concern (American Association of State Highway andTransportation Officials, (AASHTO), “Determining the RheologicalProperties of Asphalt Binder Using a Dynamic Shear Rheometer (DSR),” T315-10, Washington, D C (2011); American Association of State Highwayand Transportation Officials, (AASHTO), “Performance-Graded AsphaltBinder,” M 320-10, Washington, D C (2011); and American Association ofState Highway and Transportation Officials, (AASHTO), “Standard Practicefor Grading or Verifying the Performance Grade of an Asphalt Binder,” R29-08, Washington, D.C. (2011), all of which are hereby incorporated byreference in their entirety).

Pavements with stiff binders are more susceptible to low temperaturecracking. As a binder ages, oxidation occurs that stiffens the binder.The long-term aging in the PAV simulates 7-10 years of in-situ aging.This aged material is poured into molds for testing in a BBR. For BBRtesting the asphalt beam is immersed in a cold liquid bath for 60minutes and is then tested as a simply supported beam. A load is appliedto the center of the beam and the deflection measurements against timeare obtained. Stiffness is calculated based on measured deflection andthe beam dimensions used. The m-value is a measure of how the asphaltbinder relaxes the load induced stresses when time is equal to 60seconds. The BBR estimates the critical failure low temperature of thebinder using AASHTO R 49-09. See American Association of State Highwayand Transportation Officials, (AASHTO), “Determination ofLow-Temperature Performance Grade (PG) of Asphalt Binders R 49-09,”Washington, D.C. (2009), which is hereby incorporated by reference inits entirety. Testing was conducted at 0° C., −6° C. and −12° C. witheach group being tested in triplicate. See American Association of StateHighway and Transportation Officials, (AASHTO), “Determination ofLow-Temperature Performance Grade (PG) of Asphalt Binders R 49-09,”Washington, D C (2009); American Association of State Highway andTransportation Officials, (AASHTO), “Performance-Graded Asphalt Binder,”M 320-10, Washington, D C (2011); and American Association of StateHighway and Transportation Officials, (AASHTO), “Standard Practice forGrading or Verifying the Performance Grade of an Asphalt Binder,” R29-08, Washington, D.C. (2011), all of which are hereby incorporated byreference in their entirety. The overall experimental testing plan isshown in Table 2.

TABLE 2 Experimental Testing Plan for Vacuum Tower Bottoms RTFO BBR Nameof Additive DSR 0° C. −6° C. −12° C. None XXX XXX XXX XXX 3% HBL XXX XXXXXX XXX 1.5% HBL + 1.5% PHBL XXX XXX XXX XXX 3% PHBL XXX XXX XXX XXX1.5% PHBL XXX XXX XXX XXX 1.5% HBL XXX XXX XXX XXX 3% HBL + 3% PHBL XXXXXX XXX XXX 1% PHBL XXX XXX XXX XXX 1% HBL XXX XXX XXX XXX 1% HBL + 1%PHBL XXX XXX XXX XXX 1% HBL + 0.5% PHBL XXX XXX XXX XXX 0.5% HBL + 1%PHBL XXX XXX XXX XXX 2% HBL + 1% PHBL XXX XXX XXX XXX 1% HBL + 2% PHBLXXX XXX XXX XXX 4% HBL + 4% PHBL XXX XXX XXX XXX 5% HBL + 5% PHBL XXXXXX XXX XXX 2% HBL + 6% PHBL XXX XXX XXX XXX 6% HBL + 2% PHBL XXX XXXXXX XXX *Note: X symbolizes 1 test specimen

Example 3—Statistical Transformations of Data and Multiple RegressionModeling

In order to ensure a full factorial experiment did not need to becarried out when rejuvenating VTBs, multiple regression models weredeveloped to predict the final performance grade at both high and lowtemperatures.

To conduct a thorough statistical analysis towards the end goal ofcreating a reliable multiple regression model for predicting the highand low temperature performance grade of VTB blended with two BDMs, thedata was examined in its unmodified state as well as transformed. Thedata was evaluated in its unmodified state, logarithm base 10transformed state, and root square transformed state. Thetransformations were examined by comparing the calculated coefficient ofdetermination and the adjusted coefficient of determinations for thefinished multiple regression models for each set of transformed data.This was done for both high temperature performance grade DSR data aswell as done for the low temperature performance grade BBR data. Onemodel was selected for the prediction of the high temperatureperformance grade and another was chosen for the prediction of the lowtemperature performance grade.

Multiple Regression Modeling—To create a final multiple regressionmodel, step-down regression was used. The first step in this process wasto create a full model as shown in equation 2. The factors X1, X2, andX3 are known as HBL percentage, PHBL percentage, and temperature(Celsius), respectively. The coefficient α is the intercept of thepredicted expression while β₁ through β₁₄ are coefficients determinedthrough line fitting. The values of α, β₁ . . . β₁₄ make the residualsum of squares and the resulting equation is known as the least-squaresfit. After the full model was created, one by one the variable with thehighest p-value or least significance was eliminated from the modeluntil the model was only left with variables that are statisticallysignificant in terms of 95% confidence. This created a partial modelwhich was used as the final model for prediction of the high temperaturegrade or for the prediction of the low temperature grade of VTB blendedwith two BDMs at various dosage rates.

Y=α+β ₁ ×X1+β₂ ×X2+β₃ ×X3+β₄ ×X1×X2+β₅ ×X1×X3+β₆ ×X2×X3+β₇ ×X1×X2×X3+β₈×X1²+β₉ ×X2²+β₁₀ ×X3²+β₁₁ ×X1² ×X2²+β₁₂ ×X1² ×X3²+β₁₃ ×X2² ×X3²+β₁₄ ×X1²×X2² ×X3²+ε   (2)

For the high temperature grade the limiting criteria of 2.2 kPa forG*/sin(δ) was used. If a combination with various dosage rates of HBLand PHBL in VTB passed the limiting criteria at 64° C., but failed at70° C., the high temperature grade was 64. If a combination passed at70° C., but failed at 76° C. then a high temperature grade of 70 wasachieved. The limiting criteria for determining the low temperaturegrade was the minimum value of 0.30 for the m-value and the maximumvalue of 300 MPa for stiffness. If a combination with various dosagerates of HBL and PHBL in VTB passed at −22° C., but failed at −28° C.,the m-value must be at least equal to 0.30 at −22° C. with the stiffnessvalue being less than 300 MPa. If this situation were to occur thisbinder would have a low temperature performance grade of −22° C. The useof this model should only be employed within the temperatures tested.

Example 4—Dynamic Shear Rheometer Methods

To assess the viability of using a modified VTB instead of a neatasphalt binder a full investigation of binder properties was done basedon Superpave binder design standards. The standards were used tooptimize the dosage of LO combination materials for improved VTBperformance. The findings of this invention and the statistical analysisof the results are shown in the following examples. The relationshipbetween the invention's findings and sustainability are also discussedin the context of a broader literature review.

The dynamic shear rheometer (DSR) is used for characterizing the viscousand elastic behavior of asphalt binders between intermediate to hightemperatures. DSR tests are conducted on unaged (original), RTFO aged,and PAV aged asphalt binder samples. Asphalt binders are viscoelasticwhich means they act as both an elastic solid (recoverable deformation)and a viscous liquid (non-recoverable deformation) due to loading andunloading. The DSR measures a specimen's complex shear modulus (G*) andphase angle (δ). The complex shear modulus (G*) is a sample's totalresistance to deformation, and the phase angle (δ) is the lag betweenthe applied shear stress and the resulting shear strain. Therefore, whenthe phase angle is closer to 90 degrees the material is more viscous,while when the phase angle is closer to 0 degrees the material is moreelastic. The parameters G* and δ are used to predict whether the asphaltmix will experience rutting and/or fatigue cracking. For unaged(original) and short-term aged binder, rutting is the main concern;while for long-term aged binder, fatigue cracking is the main concern.

Example 5—Dynamic Shear Rheometer Analysis of Results, and Discussion

Short-Term Aged Dynamic Shear Rheometer Results—FIG. 1 shows the averagecritical high temperature of three tested RTFO DSR specimens for each ofthe eighteen groups. From the figure, the VTB control group has acritical high temperature between 80° C. and 81° C. This implies thehigh temperature performance grade (PG) for the control group is 76.There appears to be slight differences between the effect of HBL andPHBL with increasing dosage rate on the VTB. When the two materials areadded in combination at lower dosages the effects are much smaller onthe critical high temperature. Once higher dosage combinations are used,the effect is much larger on the VTB. From the figure, it is apparentthat if a stable drop in critical high temperature is wanted, then bothmaterials need to be used for modification of the VTB at dosages between2% and 6%. This is shown from the results of the five groups with 2%,3%, 4%, 5%, 6% HBL and 6%, 3%, 4%, 5%, 2% PHBL whose high temperaturePGs range from 64 to 70° C. Further testing was required to verify thistrend at the low temperature performance grade.

Example 6—High Temperature Performance Grade Prediction Model

To create the final multiple regression model, for use in predicting theoptimum dosage rates of HBL and PHBL for rejuvenating VTB at hightemperatures, a full statistical analysis using an ANOVA table was done.Three ANOVA models were created and analyzed. Data transformation wasdone to see which model had the highest adjusted coefficient ofdetermination, R² _(Adjusted). Two transformations (log10, RTSQ) and acontrol set (unmodified) were analyzed. To evaluate which model is best,the adjusted coefficient of determination for each of three models werecompared in Table 3. The adjusted coefficient of determination for eachset of data or model name is from the finalized form of that model. Thefinalized form of each model is created through step-down regression asdiscussed earlier. Before a model can be chosen for future use theresiduals from each model must be examined to see the spread and howclose they are to zero. This is shown in FIG. 2. From FIG. 2, it isobserved that the Log 10 transformed data model gives the best fit forthe predicted results when compared to the actual results.

TABLE 3 RTFO DSR model Coefficient of Determinations Model Name R² R²_(Adjusted) Unmodified 0.83818 0.833536 Log 10 0.92779 0.926419 RTSQ0.90327 0.900489

From the comparison of final model residuals in FIG. 3 and the resultsshown in Table 4, it was concluded that the finalized multiple linearregression model using the log10 transformed RTFO DSR data will be usedfor further analysis. The ANOVA results for the second model—log10transformed RTFO DSR data are shown in Table 4. Using the ANOVAstatistical analysis of the finalized log10 transformed RTFO DSR datamodel, the coefficients and their values were generated for theprediction equation, equation 3. These values are shown in Table 5.

TABLE 4 ANOVA of Log 10 modified RTFO DSR data model Source SS MS NumberDF Number F Ratio Prob > F Log 10 Temperature 31.078385 31.07838 12273.7 <0.0001 Data (Celsius) - X3 X1^(∧)2 0.089726 0.08973 1 6.5645 0.0111 X1 * X2 1.319528 1.31953 1 96.538 <0.0001 X1^(∧)2 * X2^(∧)20.191837 0.19184 1 14.035  0.0002

TABLE 5 Coefficients of Predicted RTFO DSR Expression Coefficients ValueA 4.77185094 β₃ −0.0565452 β₈ 0.00336935 β₄ −0.0392252 β₁₁ 0.00060913

Predicted (G*/Sin δ)=10^((α+β) ³ ^(×X3+β8×X1) ² ^(+β) ⁴ ^(×X1×X2+β) ¹¹^(×X1) ² ^(×X2) ² ⁾  (3)

Using the values shown in Table 5 in combination with equation 3, thecritical high temperature (X3) can be determined for various dosagelevels of HBL (X1) and PHBL (X2). This is done by setting equation (3)equal to 2.2 kPa, which is the critical limit for rutting of asphaltbinder. Three examples are show in Table 6 and FIG. 3. To achieve acritical high temperature performance grade (PG) of 70° C., Example 1,in Table 6, could be used where X1 and X2 are equal to 3.8% HBL and 2.8%PHBL, respectively. This is because the critical high temperature, X3 is73° C. Even though Example 2 in Table 6 (X1 and X2 are equal to 4.5% HBLand 4.4% PHBL) meets the specification at 70° C., this case would beconsidered a high PG 64 due to reliability of results. Example 3 inTable 6 (X1 and X2 are equal to 4.7% HBL and 6.5% PHBL) has criticalhigh temperature of 68.5° C. and, therefore, meets the requirement of aPG 64. From the analysis using the prediction equation, it was foundthat there must be HBL and PHBL materials blended with the VTB to reducestiffness enough to achieve a PG 64 or a PG 70 high temperature grade.

TABLE 6 Predicted G*/SinDelta at Different Dosage Levels andTemperatures X1 X2 X3 (Temperature, Predicted Example (% HBL) (% PHBL) °C.) G*/sin(δ), kPa 1 3.8 2.8 73.0 2.20 2 4.5 4.4 70.0 2.20 3 4.7 6.568.5 2.20

Example 7—Bending Beam Rheometer Results

The Bending Beam Rheometer (BBR) test is used for measuring lowtemperature properties of long-term aged asphalt binder such asstiffness and relaxation. Stiffness and relaxation measurements areindicators of an asphalt binder's ability to resist low temperaturecracking. The BBR is used to determine an asphalt binder's lowtemperature performance grade. Stiffness is calculated based on measureddeflection and the standard beam dimensions used. The m-value is ameasure of how the asphalt binder relaxes the load induced stresses at60 seconds of loading time.

The average critical low temperature determined using three beams eachat three temperatures for each of the eighteen groups is shown in FIG.4. The VTB control group has a critical low temperature between −14° C.and −15° C., low temperature performance grade (PG) for the controlgroup is −10° C. There are slight differences between the performance ofVTB when modified with smaller amounts of HBL and PHBL individually.Similar to what was observed in the high temperature test, when the twoBDMs are added in combination at lower dosages the effects are greateron VTB performance than when each BDM is added on its own to VTB.Increased dosage combinations show large improvements to VTB lowtemperature performance. The data in FIG. 4 indicates if a stable jumpin critical low temperature is preferred then both materials need to beused for modification of the VTB at dosages between 2% and 6%. This isshown by the results in FIG. 6 of the three groups with 3%, 4%, 5% HBLand 3%, 4%, 5% PHBL whose critical low temperatures range from −22° C.to −26° C.

Example 8—Low Temperature Performance Grade Prediction Model

A multiple regression model was created for use in predicting theoptimum dosage rates of HBL and PHBL for rejuvenating VTB at lowtemperature. Similar to the high temperature model development, a fullstatistical analysis using an ANOVA table was performed. Twotransformations (log10, RTSQ) and the non-transformed data set(Unmodified) were used in model development. The adjusted coefficientsof determination are shown in Table 7. The finalized form of each modelwas created through the aforementioned step-down regression process. Tochoose a model for future use, the residuals for each finalized modelmust be examined to see the spread and how close they fall within the95% confidence interval. This is shown in FIG. 5. From FIG. 5, it isobserved that the unmodified data model has the least number of outliersoutside the boxplot created with a spread of 95% confidence. Therefore,the unmodified data model provides the best fit for the predictedresults when compared to the actual results.

TABLE 7 BBR model Coefficient of Determinations Model Name R² R²_(Adjusted) Unmodified 0.91686 0.912484 Log 10 0.90497 0.901263 RTSQ0.90984 0.906326

From the comparison of the final model residual boxplots in FIG. 5 andthe R² _(Adjusted) values in Table 7, it was concluded that thefinalized multiple linear regression model using the non-transformed BBRdata will be used for further analysis. The ANOVA results for theselected model are shown in Table 8. Using the ANOVA statisticalanalysis of the finalized unmodified BBR data model the coefficients andtheir values were generated for the prediction equation, equation (4),infra. These values are shown in Table 9.

TABLE 8 ANOVA of Unmodified BBR data model Source SS MS Number DF NumberF Ratio Prob > F Unmodified Dosage Rate 0.00264824 0.0026482 1 9.96580.0019 Data HBL (%) - X1 Dosage Rate 0.02074087 0.0207409 1 78.052<0.0001 PHBL (%) - X2 Temperature (Celsius) - X3 0.05315896 0.053159  1200.05 <0.0001 X1^(∧)2 0.00134383 0.0013438 1 5.0571 0.026 X1 * X30.00217473 0.0021747 1 8.1839 0.0048 X2 * X3 0.00109399 0.001094  14.1169 0.0442 X1 * X2 * X3 0.00254656 0.0025466 1 9.5831 0.0023X1^(∧)2 * X2^(∧)2 0.00551461 0.0055146 1 20.752 <0.0001

TABLE 9 Coefficients of Predicted BBR Expression Coefficients Value A0.34042806 β₁ 0.00848827 β₂ 0.01420353 β₃ 0.00794801 β₈ 0.00095999 β₅0.00083395 β₆ 0.00059149 β₇ −0.0003285 β₁₁ −0.0001034

Predicted m-value=α+β₁ ×X1+β₂ ×X2+β₃ ×X3+β₈ ×X1²+β₅ ×X1×X3+β₆ ×X2×X3+β₇×X1×X2×X3+β₁₁ ×X1² ×X2²   (4)

Using the values shown in Table 9 in combination with equation 3,critical low temperature (X3) can be determined for various dosagelevels of HBL (X1) and PHBL (X2). This is done by setting X1 and X2 asconstant in equation (4). The critical limit for low temperature is anm-value equal to 0.30. By making X1 and X2 constant, changes in them-value can be observed for various dosage level combinations withdecreasing temperature. Three examples are shown in Table 10 and FIG. 6.Due to X1 and X2 being held constant for all three examples, thecritical low temperature (−10° C.+X3) where the predicted m-value isequal to 0.30 can be determined for each example. The critical lowtemperatures for Examples 1, 2, and 3 in Table 10 are approximately−21.9° C., −24.4° C., and −26.6° C. based upon the predicted resultsshown in FIG. 4.

TABLE 10 Predicted m-value at Different Dosage Levels X1 X2 X3 PredictedExample (% HBL) (% PHBL) (Temperature, ° C.) m-value 1 3.00 3.00 −120.30 2 4.00 4.00 −12 0.32 3 5.00 5.00 −12 0.33

Assuming there is a normal distribution around −22° C., the measuredresults from testing provide a standard deviation of 0.614° C. Ahalf-Gaussian Normal Distribution plot was created using these resultsas shown in FIG. 7. From the distribution curve, a critical lowtemperature performance grade (PG) of −22 with 50% reliability, vacuumtower bottoms need to have a dosage levels approximately equal to 3% HBLand 3% PHBL. To achieve a critical low temperature PG of −22 with atleast 95% reliability, the critical low temperature must be less than orequal to −23.3° C. For 99% reliability, the critical low temperaturemust be less than or equal to −23.8° C. Therefore, Examples 2 and 3 inTable 10 have dosage levels of HBL and PHBL that make it possible forVTB to achieve a critical low temperature performance grade (PG) of −22with at least 99% reliability.

Example 9—Optimum Dosage Levels

To determine the optimum dosage levels needed to achieve certain PGgrades, both models need to be used in combination. This process isshown in FIG. 8. In FIG. 8, five cases are shown for dosage levelsranging from 3% HBL+3% PHBL to 5% HBL+5% PHBL in 0.5% intervals for bothHBL and PHBL. To determine both the m-values at low temperature andG*/Sin δ values at high temperature equations (3) and (4) were used.Estimation of the critical temperatures was done by setting equation (3)equal to 2.2 kPa, and setting equation (4) equal to 0.30. The results ofthese five case estimations are tabulated in Table 11. From theseresults, it was found that the optimum dosage level needed to achieve aPG 70-22 binder was 3.5% HBL+3.5% PHBL. This combination gave estimatedcritical high and low temperatures of 72.2° C. and −23° C. To achieve aPG 64-22 binder the optimum dosage level needed is 4.5% HBL+4.5% PHBL.The estimated critical high and low temperature for this dosagecombination is 69.9° C. and −26.1° C., respectively.

TABLE 11 Optimum Dosage Levels and their Predicted PGs Predicted LowHigh High/Low % % Temperature m- Temperature G*/Sinδ TemperaturesPredicted Example HBL PHBL (° C.) value (° C.) (kPa) (° C.) PG 1 3.003.00 −11.9 0.3 73.5 2.2 73.5, −21.9 70-16 2 3.50 3.50 −13   0.3 72.2 2.272.2, −23   70-22 3 4.00 4.00 −14.9 0.3 70.9 2.2 70.9, −24.9 70-22 44.50 4.50 −16.1 0.3 69.9 2.2 69.9, −26.1 64-22 5 5.00 5.00 −17.2 0.369.2 2.2 69.2, −27.2 64-22

Example 10—Energy and Green House Gas (GHG) Emissions

It is shown that HBL and PHBL in combination make the performance gradeof VTB softer through both modeling and experimental results in Examples4-9 supra. Additionally, it is shown in the rotational viscosity resultsin FIG. 9 that a reduction in mixing and compaction temperature rangestake place with increasing dosage combinations of HBL and PHBL. Therotational viscometer tests were performed at 20 rpm at fourtemperatures ranging between 120° C. and 180° C. The rotationalviscometer is used for measuring pumpability of the binder and can beused to find the temperature ranges for mixing and compaction. Themixing and compaction ranges are located where viscosity readingsmeasure 0.17±0.02 Pa*s and 0.28±0.03 Pa*s, respectively (AsphaltInstitute, “Performance Graded Asphalt Binder Specification and TestingSuperpave Series No. 1 (SP-1),” Lexington, Ky. (2003), which is herebyincorporated by reference in its entirety). From these results, it issuggested that the mixing and compaction temperatures are reduced from174° C. to 168° C., and 163° C. and from 163° C. to 156° C., and 151° C.when HBL and PHBL are used in combination at 3%+3% and 5%+5% formodification of VTB. According to Zapata, P. & Gambatese, J. A., “EnergyConsumption of Asphalt and Reinforced Concrete Pavement Materials andConstruction,” J. Infrastruct. Syst. 11:9-20 (2005), which is herebyincorporated by reference in its entirety), 48% of energy consumptionoccurs during the drying and mixing of aggregates with asphalt binder,while 40% energy is consumed during the production of asphalt binder inpetroleum refineries. Thus, the other 12% energy is consumed during thetransport and laydown of asphalt concrete.

To estimate the effect of HBL and PHBL modification on VTB for use inthe production of hot mix asphalt (HMA) a cost-benefit analysis was doneto assess the impact to energy consumed during drying and mixing ofaggregates with asphalt binder. To this effect a theoretical mix designwas created as shown in FIG. 10 with an optimum binder content of 5.2%and mix density of 2.37 g/cm³. The makeup of this mix gradation was 72%limestone, 15% quartzite, and 13% sand. In addition, three commonly usedasphalt mix plant fuel types (coal, diesel, and natural gas) were usedfor the cost-benefit analysis. The prices for these fuels are asfollows: coal ($40.20/tonne), diesel ($0.63/litre), and natural gas($0.13/m3) (Conti et al., “Annual Energy Outlook 2012 with Projectionsto 2035. United States of America Department of Energy,” Office ofIntegrated and International Energy Analysis. (2012), which is herebyincorporated by reference in its entirety).

To evaluate the energy consumed during the mixing and drying process,five areas were examined: (1) energy required for heatingaggregates—E_(ha), (2) energy required for heating water—E_(hw), (3)energy required for vaporizing water—E_(vw) (4) energy required to heatsteam—E_(hs), and (5) energy required for heating asphalt binder—E_(hb),based on past and current literature (Almeida-Costa et al., “Economicand Environmental Impact Study of Warm Mix Asphalt Compared to Hot MixAsphalt,” J. Clean. Prod. 112:2308-2317. Part 4. (2016); Romier et al.,“Low-Energy Asphalt With Performance of Hot-Mix Asphalt,” Transp. Res.Rec. J. Transp. Res. Board 101-112 (2006), which are hereby incorporatedby reference in their entirety). Other researchers such as Hamzah etal., “Evaluation of the Potential of Sasobit® to Reduce Required HeatEnergy and CO2 Emission in the Asphalt Industry,” J. Clean. Prod.18:1859-1865 (2010) and Jamshidi et al., “Selection of Reclaimed AsphaltPavement Sources and Contents for Asphalt Mix Production Based onAsphalt Binder Rheological Properties, Fuel Requirements and GreenhouseGas Emissions,” J. Clean. Prod. 23:20-27 (2012), both of which arehereby incorporated by reference in their entirety) assumed that theaggregates were dry and had no excess moisture to begin with and thusareas 2, 3, and 4 were not considered in energy calculations. However,it has been shown historically that moisture content of aggregates playsa big role in production costs at asphalt mix plants. Just to start theremoval process of moisture from aggregates means that the aggregatesmust be at least heated over 100° C., the boiling point of water, and toreach 160° C., 10 L of fuel is required for the removal of 5% moisturefrom 1 tonne of aggregates (Gillespie, I., “Quantifying the Energy Usedin an Asphalt Coating Plant. Department of Mechanical and AerospaceEngineering,” University of Strathclyde, United Kingdom (2012), which ishereby incorporated by reference in its entirety).

The following Equation (5 through 9) were used to determine the energyconsumed during the five energy consumption areas:

E _(ha) =Q _(a) ×m _(a)×(t _(a) −t _(amb))  (5)

E _(hw) =Q _(w)×(h/100)×m _(a)×(373.2−t _(amb))  (6)

E _(vw) =L×(h/100)×m _(a)  (7)

E _(hs) =Q _(s)×(h/100)×m _(a)×(t _(a)−373.2)  (8)

E _(hb) =Q _(b) ×m _(b)×(t _(b) −t _(amb))  (9)

Where all E_(x) values are in Joules (J), Q is specific heat ofa—aggregates, w—water, s—steam, and b—binder (J/kg⁻¹·K⁻¹), m_(a) is massof aggregates (kg), t is the heating temperature (K) for a—aggregatesand b—binder, and t_(amb) is the ambient temperature (K), L is thelatent heat of water vaporizing (J/kg), and h is the moisture content ofthe aggregates (%). The ambient temperature is assumed to be 293.2 K(20° C.), the average temperature during the summer in the MidwesternRegion of the United States. The following values for use with equation5 through 9 are shown in Table 12 below, adapted from Almeida-Costa etal., “Economic and Environmental Impact Study of Warm Mix AsphaltCompared to Hot Mix Asphalt,” J. Clean. Prod. 112:2308-2317. Part 4.(2016); Harder et al., “Energy and Environmental Gains of Warm andHalf-Warm Asphalt Mix: Quantitative Approach,” In: TransportationResearch Board 87th Annual Meeting (2008); Cutnell et al., Physics, 10ed. John Wiley & Sons, Inc., United States (2014); Romier et al.,“Low-Energy Asphalt With Performance of Hot-Mix Asphalt,” Transp. Res.Rec. J. Transp. Res. Board 101-112 (2006); and Waples et al., “A Reviewand Evaluation of Specific Heat Capacities of Rocks, Minerals, andSubsurface Fluids. Part 1: Minerals and Nonporous Rocks,” Nat. Resour.Res. 13:97-122 (2004), all of which are hereby incorporated by referencein their entirety.

TABLE 12 General Values for Use in Calculating Heat Energy ParameterValue SI units Ambient temperature 293.2 K Specific heat of limestone880.0 J/(kg K) Specific heat of quartzite 1013.0 J/(kg K) Specific heatof sand 775.0 J/(kg K) Specific heat of water 4185.0 J/(kg K) Specificheat of steam 2020.0 J/(kg K) Specific heat of asphalt 2093.4 J/(kg K)Latent heat of water vaporization 2256.0 kJ/kg Moisture content ofaggregates 3.0 % Heating temperature of aggregates - VTB control 436.2 KHeating temperature of aggregates - 3% HBL + 3% 429.2 K PHBL Heatingtemperature of aggregates - 5% HBL + 5% 424.2 K PHBL Heating temperatureof asphalt - VTB control 447.2 K Heating temperature of asphalt - 3%HBL + 3% 441.2 K PHBL Heating temperature of asphalt - 5% HBL + 5% 436.2K PHBLUsing equation 5 through 9 the total heat energy required to produce 1tonne of mix was determined for the control VTB, 3% HBL+3% PHBL, and 5%HBL+5% PHBL groups as shown in Table 13. Energy reductions of 3.24% and5.59% were seen, due to the use of lower production temperatures.

TABLE 13 Heat Energy Required to Produce 1 Tonne of Mix Heat energyrequired (J) 3% HBL + 5% HBL + Parameter Control 3% PHBL 5% PHBLAggregtes heating 1.20E+08 1.14E+08 1.10E+08 Water heating 9.25E+069.52E+06 9.52E+06 Water vaporization 6.42E+07 6.42E+07 6.42E+07 Steamheating 3.62E+06 3.22E+06 2.93E+07 Asphalt heating 1.68E+07 1.61E+071.56E+07 Total heating 2.14E+08 2.07E+08 2.02E+08 % reduction 3.24%5.59%

The last step of the cost-benefit analysis is the examination of theeffect of lower production temperatures on fuel quantities, prices andemissions. As stated earlier, the price for coal is $40.20/tonne, dieselis $0.63/litre, and natural gas is $0.13/m3 (Conti et al., “AnnualEnergy Outlook 2012 with Projections to 2035. United States of AmericaDepartment of Energy,” Office of Integrated and International EnergyAnalysis. (2012), which is hereby incorporated by reference in itsentirety). Using the heat energy conversion coefficients and emissionsproduced per unit fuel used shown in Table 14, the values shown in FIGS.11A-11B and 12A-12D (Deru, M. P. & Torcellini, P. A., “Source Energy andEmission Factors for Energy Use in Buildings. National Renewable EnergyLaboratory Golden, Colo. (2007) and Manual, E. S., “Energy StatisticsDivision of the International Energy Agency (IEA) in Co-operation withthe Statistical Office of the European Communities (Eurostat),” Paris,France (2005), which are hereby incorporated by reference in theirentirety) were determined. Although these reductions in energy, fuelquantities and prices, as well as emissions may seem small (3.24%, and5.59%), they are still savings and reducing the exposure of theenvironment to emissions.

TABLE 14 Emissions Per Unit Fuel Used & Heat Energy ConversionCoefficients Fuel type CO₂ NO_(X) SO_(X) CO Unit Coefficient Coal (kg/t)2630 5.75 1.66 2.89 Tonne/MJ 0.0000395 Diesel (kg/l) 2.73 2.58E−034.09E−03 6.48E−04 I/MJ 0.0255877 Natural gas (kg/m³) 1.96 1.78E−061.01E−08 1.50E−06 m²/MJ 0.0265590

Example 11—Environmental Concerns and Benefits

Reproducibility of results with VTB from different sources—VTB arealready used in asphalt binder, but are primarily used as a blend agent,and are not used directly without blending softer asphalt binders forpaving roadways. This invention provides a method for creating VTBmaterials at paving grades without the need to blend with other asphaltmaterials. This is beneficial environmentally because it improves theutility of a co-product while increasing the percentage of bio-renewableproducts used in the binder thereby replacing a purely petroleum-basedbinder with a VTB-LO blend. The study achieved pavement performancegrades with various dosage combination of linseed-based materials tocreate models for estimating dosages to attain certain performancegrades. This process can be easily repeated using the same linseedderived materials with VTB derived from other sources and othervegetable feedstocks for producing heat bodied and partiallyhydrogenated heat bodied oils.

The study showed that bio-renewable linseed oil combinations werehelping achieve the value-added performance grade of the binder. Thereason for this is postulated in other research findings that it ispossible to convert heavier asphaltenes into maltenes throughhydrogenation reactions (Xu et al., “Hydro-Treatment of Athabasca VacuumTower Bottoms in Supercritical Toluene With Microporous ActivatedCarbons and Metal-Carbon Composite,” Fuel 88:2097-2105 (2009), which ishereby incorporated by reference in its entirety). Thus, because one ofthe linseed derived materials is hydrogenated heat bodied linseed oilused for creating the dosage material combinations a reaction could beoccurring during the blending process (conversion of asphaltenes tomaltenes). All VTBs have much larger amounts of heavy asphaltenes due tothe refining process that strips the heavier oil products of theirlighter oil components. Due to this, it is possible to reproduce thisprocess of rejuvenating VTB from other sources. There might be slightchanges in the chemical makeup of VTBs from different sources, but themain task of rejuvenating a heavily “aged” asphalt binder is to convertasphaltenes to maltenes to achieve an acceptable ratio ofasphaltenes/maltenes for performance graded binder.

Environmental footprint through sustainable reuse of materials—Most VTBproduced during refining are used as blend agents in asphalt. However,some, the bottom material of VTB is landfilled because it is too hard topump and use. This material is labeled as non-hazardous solid waste.Problems can occur in landfills with VTBs because of risingtemperatures. When temperatures rise, VTB becomes softer and moreflowable. Add on top of this the stress felt by VTB due to being underlayers of other material in a landfill, VTBs could be pushed out of thelandfill transforming a nonhazardous material into a hazardous material(Han, J. & Lin, C., “GeoFlorida 2010. In: A Feasibility Study onReducing Flowability of Vacuum Tower Bottoms Using Aggregate,” pp.2787-2793 (2010), which is hereby incorporated by reference in itsentirety). Past researchers have examined the use of mixing aggregateswith VTBs before landfilling to prevent these problems. However, thisapproach has so far not been put into practice in the field (Han, J. &Lin, C., “GeoFlorida 2010. In: A Feasibility Study on ReducingFlowability of Vacuum Tower Bottoms Using Aggregate,” pp. 2787-2793(2010), which is hereby incorporated by reference in its entirety). Itis felt that through the method shown in this study much more VTB can beprevented from being landfilled.

Even though asphalt binder is inert and insoluble in water, asphalticmaterials like pavements and roofing shingles are subject to runoff fromrainfall events (Brandt et al., “Aqueous Leaching of Polycyclic AromaticHydrocarbons From Bitumen and Asphalt,” Water Res. 35, 4200e4207 (2001)and Kriech, A. J., “Evaluation of Hot Mix Asphalt for Leachability,”Heritage Research Group, Indianapolis, Ind. (1990), which are herebyincorporated by reference in their entirety). There have been reports ofheavy metal contamination in highway runoff water and in soils nearsroadways (Lau et al., “Characteristics of Highway Stormwater Runoff inLos Angeles: Metals and Polycyclic Aromatic Hydrocarbons,” WaterEnviron. Res. 81:308-318 (2009); Pagotto et al., “Comparison of theHydraulic Behaviour and the Quality of Highway Runoff Water According tothe Type of Pavement,” Water Res. 34:4446-4454 (2000); Warren et al.,“Heavy metal levels in atmospheric particulates, roadside dust and soilalong a major urban highway. Sci. Total Environ. 59:253-256 (1987),which are hereby incorporated by reference in their entirety). However,it has been shown that the heavy metal contamination comes from vehiclesand not from asphalt pavements (Cooper et al., “The Impact of Runofffrom Asphaltic Products on Stream Communities in California,” FederalHighway Administration, California State Department of TransportationFinal Report FHWA. CA/TL-96/24 (1996) Birgisdottir et al., “Leaching ofPAHs From Hot Mix Asphalt Pavements,” Environ. Eng. Sci. 24:1409-1422(2007), which are hereby incorporated by reference in their entirety)studied the leachability of 16 polyaromatic hydrocarbons (PAH)sdesignated by the U.S. Environmental Protection Agency (EPA) of concern,and used the results to model long term leaching of PAHs from asphaltroadways. They found that when studying the leaching of PAHs in asphaltpavement, the same diffusion coefficient could be used for the 16 PAHs.It was also seen through long-term modeling (25 years) that the level ofall 16 PAHs were found to be much lower than the soil quality criteriaof 1.5 mg kg_1 in Denmark. From their results they concluded that if thelevel of PAHs is above the criteria it is not due to leaching from anasphalt pavement (Birgisdottir et al., “Leaching of PAHs From Hot MixAsphalt Pavements,” Environ. Eng. Sci. 24:1409-1422 (2007), which ishereby incorporated by reference in its entirety). Research by Legret etal. “Leaching of Heavy Metals and Polycyclic Aromatic Hydrocarbons FromReclaimed Asphalt Pavement,” Water Res. 39:3675-3685 (2005), which ishereby incorporated by reference in its entirety, found that leaching ofheavy metals in both virgin asphalt pavements and recycled asphaltpavements (RAP) were well below drinking water limits. However, it wasfound that leaching of PAHs from RAP was much higher than for virginasphalt pavement (Legret et al. “Leaching of Heavy Metals and PolycyclicAromatic Hydrocarbons From Reclaimed Asphalt Pavement,” Water Res.39:3675-3685 (2005), which is hereby incorporated by reference in itsentirety).

VTB is not RAP, but is material akin to virgin asphalt binder, but a lotstiffer. It is believed that VTB would act the same as virgin asphaltbinder in a pavement and leaching of heavy metals and PAHs would bebelow drinking water limits in nearby soils and groundwater. The mainpoint of this study is that instead of using VTB as a blend agent withSuperpave performance graded asphalt binder, full reuse and substitutioncan be done through complete rejuvenation. This means production ofhigher value products such as gasoline and specialty chemicals could beincreased, due to the fact that higher amounts of VTB could berejuvenated back into a good performance graded asphalt binder for usein paving roadways.

Costs implications—VTB is a low-value material due to limitedapplications in paving because of poor performance at low temperaturesdue to its stiff properties; price range is around $120 to $180 per tonof liquid VTB, while asphalt binder (even with the current low oilprices) range from $300 to $350 per ton of liquid asphalt. The cost ofVTB modification using linseed based materials such as HBO and PHBO indosages at 4.5% and 4.5% would drive the cost of VTB up to the rangefrom $290 to $345 per ton of modified liquid VTB in the current marketand pending further research. This dosage combination transforms thisVTB from PG 76-10 to PG 64-22. The economics for performing the linseedmodification would be further incentivized if neat asphalt prices rise.

Example 12—Conclusions and Recommendations

The findings of this study show that HBL and PHBL can be used incombination as rejuvenators for VTB and have the potential to change theoriginal binder grade from 76-10 to PG 70-22 and PG 64-22 binder grades.The testing plan included an extensive binder testing plan to fullyevaluate the potential of the two BDM and to determine optimal dosagelevels for each material. Binder testing showed how each BDM impactedrheological properties.

The DSR test results verify that maintaining a high temperature grade of70° C. and 64° C. is possible. The bending beam rheometer tests showthat to achieve a low temperature grade of −22° C., at least 3% of HBLand 3% PHBL must be used in combination. From the analysis using theprediction equation, it was found that there must be both BDMs blendedwith the VTB to achieve a −22° C. low temperature grade. The datagathered from testing was successfully used to create linear multipleregression models with adjusted coefficients of determination greaterthan 90% for predicting RTFO DSR, and BBR results.

It is recommended that further testing take place using the sameexperimental plan, but with linseed based materials from differentsource locations with different chemistry. Another step would be tocross materials together from different source locations to estimateoptimum dosage levels for the rejuvenators to achieve a PG 64-22, and PG70-22 binder grade. This would help identify whether smaller dosagescould be used to achieve the same impact on VTB rheological performance.It would also be beneficial to evaluate other vegetable oil sources aswell in the same manner as that done for the linseed based materials.

Example 13—Further Experimental Materials and Methods

Vacuum tower bottoms are a very stiff form of asphalt binder thatusually grade out at performance grades (PG) 76-10, 82-10, or 82-16. Forthis example, one source of vacuum tower bottoms from an Illinoisrefinery with a penetration grade of 20-30 and a performance grade (PG)of PG 76-10 was used. Two bio-derived materials from linseed oil wereused in this research work—Heat Bodied Linseed Oil (HBO), and PartiallyHydrogenated Heat Bodied Linseed Oil (PHBO) for the creation of twogroups, while a bio-derived commercial modifier (CM) currently in themarket was used in the creation of two more groups for comparisonpurposes. The properties for HBO and PHBO are shown in Table 1 above.

The amount of rejuvenator was determined through an extensive dosagestudy using the HBO and PHBO materials with the same source VTB materialin past work. Looking at the critical high and low temperatures it isseen that the rejuvenator combination of HBO and PHBO perform similarlyto the commercial rejuvenator CM at similar dosages as shown in Table15.

TABLE 15 Performance Grades (PG) of Control and Rejuvenator GroupsCritical High Temp Critical Low Temp Group Name (° C.) (° C.) PG GradeControl 80.5 −14.05 76-10 3% HBO + 3% 72.8 −22 70-16 PHBO 5% HBO + 5%68.4 −25.97 64-22 PHBO 6% CM 69.86 −22.66 64-22 10% CM 63.03 −26.4658-22

A surface mix with a 10 million ESAL design level from the IowaDepartment of Transportation (DOT) was used to construct bulk specificgravity specimens (height—115 mm, diameter—150 mm) and dynamic modulusspecimens (height—150 mm, diameter—100 mm) with air voids at 7%±0.5% forfive groups (includes the control VTB). The blended aggregate gradationand source information used for this mix design are shown in Table 16.

TABLE 16 Mix Design Gradation and Supplier Information Martin Martin Oldcastle Martin Martin Marietta Marietta Materials Hallet MariettaMarietta (Ames) (Ames) Group (Ames) (Ames) (Ames) Source 12.5 mm 9.5 mm(Johnston) Natural Manuf. Agg Aggregate Limestone Limestone QuartziteSand Sand Lime Blend U.S. Sieve, 29% 16% 15% 13% 15% 12% 100% Sieve mm %Passing % Passing % Passing % Passing % Passing % Passing % Passing 3/4″19.0 100.0 100.0 100.0 100.0 100.0 100.0 100.0 1/2″ 12.5 79.7 100.0100.0 100.0 100.0 100.0 94.1 3/8″ 9.5 65.8 90.1 71.5 100.0 100.0 100.084.2 #4 4.75 37.2 20.5 5.1 96.8 95.2 99 53.6 #8 2.36 18.1 2.1 2.2 64.265.5 97 35.7 #16 1.18 12.5 0.7 2.0 33.7 36.3 75 22.9 #30 0.60 9.5 0.41.9 11.4 17.4 53 13.6 #50 0.30 7.5 0.3 1.9 0.9 6.5 38 8.2 #100 0.15 6.20.3 1.5 0.1 1.9 29 5.8 #200 0.075 5.2 0.3 1.2 0.0 0.8 22.3 4.5

Mix specimens were mixed and compacted at 155° C. after two hours ofcuring for a fixed mass to achieve 7%±0.5% air voids; bulk specificgravity specimens (height—115 mm, diameter—150 mm) and dynamic modulusspecimens (height—150 mm, diameter—100 mm) using a Superpave gyratorycompacter (SGC) according to AASHTO T 312 and air voids were measuredaccording to AASHTO T 166 (AASHTO. T 166—“Bulk Specific Gravity ofCompacted Hot Mix Asphalt (HMA) Using Saturated Surface-Dry Specimens,”AASHTO T 166-11. Washington, D.C.: American Association of State Highwayand Transportation Officials (2011) and AASHTO. T 312—“Preparing andDetermining the Density of Hot Mix Asphalt (HMA) Specimens by Means ofthe Superpave Gyratory Compactor,” AASHTO T 312-12. Washington, D.C.:American Association of State Highway and Transportation Officials(2012), both of which are hereby incorporated by reference in theirentirety). Six semi-circular bend (“SCB”) test specimens were producedfrom each G_(mb) specimen with approximate dimensions of 25±2 mm inthickness, and 150±9 mm in diameter and notch length of 15±0.5 mm withthe notch width being no wider than 1.5 mm. Each SCB specimen underwentpreconditioning for two hours at −12° C. in the environmental chamberbefore testing.

Example 14—Mixture Testing Methods for Dynamic Modulus Test andSemi-Circular Bend Test

Dynamic Modulus Test—The dynamic modulus test is a linear viscoelastictest used on asphalt mix specimens where the complex dynamic modulus|E*| is estimated by relating stress to strain at several temperatureswith each temperature at several different frequencies. The complexdynamic modulus |E*| is a very important property, because it is used torepresent a pavement's stiffness response under repeated traffic loading(several frequencies) (Brown et al., “Hot Mix Asphalt Materials, MixtureDesign, and Construction,” 3rd ed. Lanham, Md.: NAPA Research andEducation Foundation (2009), which is hereby incorporated by referencein its entirety). Asphalt mix stiffness is very temperature dependentwhen loaded. Asphalt mix with lower strain is due to the stiffness beinghigh under an applied stress. At high temperatures, stiffer mixtures areless prone to permanent deformation, but at low temperature are moreprone to cracking (Brown et al., “Hot Mix Asphalt Materials, MixtureDesign, and Construction,” 3rd ed. Lanham, Md.: NAPA Research andEducation Foundation (2009), which is hereby incorporated by referencein its entirety).

|E*| varies with both temperature and load frequency. This means thattrying to compare results gained from testing at one temperature toresults from another temperature is very difficult. To be able to make acomparison between results from different test temperatures, dynamicmodulus master curves can be developed. They provide a direct means ofviewing all the results gained from multiple test temperatures andfrequencies in one visual representation (Christensen et al.,“Interpretation of Dynamic Mechanical Test Data for Paving Grade AsphaltCements (with discussion),” Journal of the Association of Asphalt PavingTechnologists 61 (1992), which is hereby incorporated by reference inits entirety). According to research conducted by Li and Williams (Li etal., “A Practical Dynamic Modulus Testing Protocol,” J. Test Eval.40(1):100-6 (2012) which is hereby incorporated by reference in itsentirety), three test temperatures (4.4, 21.1, and 37.8° C.) could beused instead of five, because the results did not change the shape offinal master curve developed. This was determined due to there beingdata from nine frequencies ranging from 25 Hz to 0.1 Hz instead of datafrom six frequencies ranging from 25 Hz to 0.1 Hz. For this researchwork |E*| master curves will be fitted using the sigmoidal function(Pellinen et al., “Stress Dependent Master Curve Construction forDynamic (complex) Modulus (with discussion),” Journal of the Associationof Asphalt Paving Technologists. 71 (2002), which is hereby incorporatedby reference in its entirety). The number of specimens tested for eachgroup was set at three. The mathematical expression of the sigmoidalfunction is shown in equations 10 through 12 (Pellinen et al., “StressDependent Master Curve Construction for Dynamic (complex) Modulus (withdiscussion),” Journal of the Association of Asphalt PavingTechnologists. 71 (2002), which is hereby incorporated by reference inits entirety):

$\begin{matrix}{{\log{E^{*}}} = {\delta + \frac{\alpha}{1 + e^{\beta + {\gamma{({{lo}\; g\; t_{r}})}}}}}} & (10) \\{{a(T)} = \frac{t}{t_{r}}} & (11) \\{{\log\left( {a\left( T_{i} \right)} \right)} = {{aT}_{i}^{2} + {bT}_{i} + c}} & (12)\end{matrix}$

-   -   t_(r)=Reduced time of loading at reference temperature (s);    -   δ, α, β, γ=Coefficients;    -   a(T)=Shift factor as a function of temperature;    -   t=Time of loading (s);    -   T=Temperature (° C.);    -   a(T_(i))=Shift factor as a function of Temperature T_(i);    -   a, b, c=Coefficients for shift factor.

The time-temperature superposition principle must be used to construct acomplex dynamic modulus master curve using data gained from testing atseveral frequencies within several test temperatures through equations10 through 12.

Semi-circular Bend Test—The semi-circular bend (SCB) test is a HMAfracture test used at low temperatures. Recently the SCB test has becomemore well known among researchers because specimen fabrication is simpleand easily reproducible using both standard laboratory compacted orfield cored asphalt concrete samples (Chong et al., “New Specimen forFracture Toughness Determination for Rock and Other Materials,” Int JFract. 26(2):R59-R62 (1984); Krans et al., “Semi-Circular Bending Test:A Practical Crack Growth Test Using Asphalt Concrete Cores,” RILEMPROCEEDINGS: CHAPMAN & HALL p. 123-32 (1996); and Marasteanu et al.,“Low Temperature Fracture Test for Asphalt Mixtures,” FifthInternational RILEM Conference on Reflective Cracking in Pavements:RILEM Publications SARL p. 249-56 (2004), all of which are herebyincorporated by reference in their entirety). Within this test, twofracture modes can be studied—mode I or mode II. The fracture modedepends on initial notch orientation. Within this work, mode I fracturewill be used for specimen preparation, testing, and analysis. Fractureenergy (G_(f)), fracture toughness (K_(IC)), and stiffness (S) are theparameters determined using the SCB test results (Li et al., “Effect ofFactors Affecting Fracture Energy of Asphalt Concrete at LowTemperature,” Road Materials and Pavement Design 9(sup1):397-416 (2008);Li et al., “Evaluation of the Low Temperature Fracture Resistance ofAsphalt Mixtures Using the Semi Circular Bend Test (with discussion),”Journal of the Association of Asphalt Paving Technologists 73 (2004); Liet al., “Using Semi Circular Bending Test to Evaluate Low TemperatureFracture Resistance for Asphalt Concrete,” Exp Mech. 50(7):867-76(2010); Lim et al., “Stress Intensity Factors for Semi-CircularSpecimens Under Three-Point Bending,” Engineering Fracture Mechanics44(3):363-82 (1993); Marasteanu et al., “National Pooled FundStudy—Phase II: Final Report—Investigations of Low Temperature Crackingin Asphalt Pavements,” MN/RC 2012-23 (2012); and Teshale, E. Z.,“Low-Temperature Fracture Behavior of Asphalt Concrete in Semi-CircularBend Test,” University of Minnesota (2012), all of which are herebyincorporated by reference in their entirety).

For this test, a vertical compressive load is applied at the top of eachspecimen so a constant crack mouth opening displacement (CMOD) of 0.0005mm/s is achieved, as described in AASHTO TP 105-13. More details withregard to equipment, test setup, and specific test conditions for theSCB test are provided in AASHTO TP 105-13. The parameter fracture energyis determined as the area under load-CMOD curve, while toughness andstiffness are determined using load and load line displacement (LLD)results recorded for each tested specimen (American Association of StateHighway and Transportation Officials, (AASHTO), “AASHTO. TP 105,“Determining the Fracture Energy of Asphalt Mixtures Using theSemicircular Bend Geometry (SCB), AASHTO TP 105-13,” Washington, D.C.(2013) and Leng et al., “Effect of Reheating Plant Warm SMA on ItsFracture Potential,” 7th RILEM International Conference on Cracking inPavements: Springer, p. 1341-9 (2012), both of which are herebyincorporated by reference in their entirety). A linear variabledifferential transformer (LVDT) built into the actuator was used torecord load line displacement (Marasteanu et al., “National Pooled FundStudy—Phase II: Final Report—Investigations of Low Temperature Crackingin Asphalt Pavements,” MN/RC 2012-23 (2012), which is herebyincorporated by reference in its entirety). For this test, at leastthree specimens were used from each group for testing at −12° C. andanalysis. The results used for further analysis from the SCB test willbe fracture energy (G_(f)).

Example 15—Discussion of Results for Dynamic Modulus Test and |E*|Master Curves

Using the sigmoidal function master curves were created using resultsgained from testing three specimens from each of the five groups atthree temperatures—4° C., 21° C., and 37° C., each at nine frequenciesbetween 25 Hz and 0.1 Hz. The master curves are shown in FIG. 13A(temperature) and FIG. 13B (reduced frequency).

From the results shown in FIG. 13A, as the temperature decreases, thegroups diverge from one another with some showing lower dynamic modulusresults than others. The groups 10% CM and 5% HBO+5% PHBO show thebiggest decrease in their dynamic modulus results when compared to theVTB control group, while 6% CM and 3% HBO+3% PHBO show a slightly lowerdecrease in the dynamic modulus values than the aforementioned twogroups when compared to the VTB control group. As the temperatureincreases there appears to be a slope shift for the group 5% HBO+5% PHBOas compared to the other three rejuvenator groups at 33° C., where therate of stiffness decreasing gradually gets smaller. There might be anerror due to extrapolation for the group 3% HBO+3% PHBO as the slope ofthe curve is very similar to the slope for the group 5% HBO+5% PHBO upuntil 33° C. Whereas the other groups with CM have a different slopethat is more akin to the control, but shifted downward. These resultscould be interpreted to mean that HBO+PHBO decreases stiffness much moreat lower temperatures than at higher temperatures as compared to thecommercial rejuvenator CM. This could mean that HBO+PHBO widen thecontinuous grade range more than CM, and thus could be more valuable asa rejuvenator. The results do not appear different when examiningdynamic modulus against reduced frequency as shown in FIG. 13B. This isalso an indication that the rejuvenator HBO+PHBO is working and workingbetter than CM. To further prove this statement statistical analysismust be done.

Statistical Analysis of |E*| Results—The measured dynamic modulus testedat the aforementioned three temperatures (° C.) and nine frequencies(Hz) for each of the five groups are shown in FIG. 14. The data trendsindicate that dynamic modulus for all five groups increase withincreasing frequency and decrease with decreasing temperature. Allmeasured data from each individual specimen was used in statisticalanalysis (fifteen specimens worth of data at nine frequencies, and threetemperatures). Anomalies were not parsed as there were none found duringtesting.

An analysis of variance (“ANOVA”) using a split-plot/repeated measures(“SPRM”) design was conducted to examine which factors affect thedynamic modulus values. For the SPRM design the whole plot factorexamined was group—A, and the sub plot factors examined were frequency(Hz)—B, and temperature (° C.)—C. All the interactions between A, B, andC were examined. The ANOVA for the data shown in FIG. 14 is shown inTable 17. For a factor/interaction to be significant under status thep-value must be less than or equal to 0.05 (statistically significantsource of variability at the 95% confidence level).

TABLE 17 ANOVA of E*, MPa using split plot repeated measure designSource DF SS MS F-value p-value Status A 4 4.04E+09 1.01E+09 19.430.0001 Significant B 8 4.50E+09 5.62E+08 174.35 <0.0001 Significant A*B32 7.24E+07 2.26E+06 0.70 0.8862 Not-significant C 2 2.68E+10 1.34E+104149.72 <0.0001 Significant A*C 8 8.92E+08 1.11E+08 34.55 <0.0001Significant B*C 16 8.90E+08 5.56E+07 17.24 <0.0001 Significant A*B*C 641.42E+08 2.22E+06 0.69 0.9632 Not-significant Speci- 10 5.19E+085.19E+07 16.10 <0.0001 Significant men No. [A] & Random Error 2608.39E+08 3.23E+06 Total 404 3.87E+11 *A = Group, B = Frequency (Hz), andC = Temperature (° C.). *Note: DF—degrees of freedom, SS—sum of squares,MS—mean square.

From Table 17, the main factors of interest are if the groups aredifferent from one another, and if the interaction between group andtemperature is a significant source of variability. These are importantwhen looking at the effect on performance from the modification of thecontrol group with rejuvenators. Both of these factors are significant.To look more closely at the interaction between group and temperature,least square mean differences gained from the student's t-test aredetermined as shown in Table 18. When levels (groups) are not connectedby the same letter, then this mean said levels are statisticallysignificantly different according to a 95% confidence interval. Thismeans that there is a 5% chance that the groups are not found to bedifferent from one another. From the results, it is shown that the group5% HBO+5% PHBO shows the best performance at 4° C. in terms of theinfluence of the rejuvenator and dosage on VTB. At 21° C., both groups10% CM and 5% HBO+5% PHBO show the best performance, while, at 37° C.,no differences are seen between the different rejuvenators/dosage levelgroups. The only difference at 37° C. is from the control VTB groupwhich has the highest dynamic modulus value. From the dynamic modulusresults, it can be said that the rejuvenator dosage combination 5%HBO+5% PHBO shows the biggest improvement with 10% CM close behind.

TABLE 18 Student's t least square means differences of E* results forA*C interaction Group Name 6% 10% 3% HBO + 5% HBO + Temperature (° C.)Control CM CM 3% P HBO 5% P HBO  4 A B D C E (31,204.22) (22,807.22)(19,442.59) (20,639.44) (17,714.67) 21 F G H G H (16,247.3) (10,080.3)(6,708.333) (9,806) (6,319.63) 37 I J J J J (5,080.556) (2,474.167)(1,745.811) (2,470.433) (1,680.904) *Levels not connected by same letterare significantly different.

Example 16—Discussion of Results for Semi-Circular Bend Test andFracture Energy Results

Average fracture energy (G_(f)) results (computed using at least threetest specimens) at −12° C. for each group are shown in FIG. 15. Thefracture energy results are shown in order from smallest to largest(bars shown for each group are 95% confidence intervals). From visualobservation, it appears that the group 5% HBO+5% PHBO is different fromthe VTB control group according to the confidence intervals shown. Thegroup 5% HBO+5% PHBO also has the highest fracture energy, thus, showingthere is improvement in low temperature performance. It is clear that 6%CM, 10% CM, and 3% HBO+3% PHBO are not different from the control VTBgroup. However, it is not clear if these three groups are found to bedifferent from the group 5% HBO+5% PHBO. For this, a more thoroughstatistical analysis is needed.

Statistical Analysis of Fracture Energy Results—For the statisticalanalysis of fracture energy results, a randomized complete block (RCB)design was chosen to conduct an ANOVA, with the block factor beinggroup. The results from the RCB designed ANOVA are shown in Table 19.Within this analysis, air voids was not a factor of interest as SCBspecimens used in testing had air voids of 7%±0.5%. From Table 19,“group” is not a statistically significant source of variability. Thismeans all the groups are not found to be statistically different fromone another. As stated earlier, a source is only significant if thep-value is less than or equal to 0.05 according to a 95% confidenceinterval. However, FIG. 15 speaks differently and shows there aredifferences between some groups.

TABLE 19 ANOVA of G_(f) (J/m²) Source DF SS MS F-value P-value StatusGroup 4 32508.445 8127.11 1.7099 0.2122 Not-significant Error 1257035.421 4752.95 C. Total 16 89543.866 * Note: DF—degrees of freedom,SS—sum of squares, MS—mean square.

To look more closely at the differences between the groups in terms offracture energy, a least square means plot was done using the Student'st-test for the factor group. This plot is shown in FIG. 16. Groups thatare not connected by same letter are statistically significantlydifferent from one another. From this plot, 5% HBO+5% PHBO is the onlygroup statistically different from the control VTB group (letter “A”),while groups 3% HBO+3% PHBO and 10% CM were not found to be differentfrom 5% HBO+5% PHBO. Even though both rejuvenators/rejuvenatorcombinations increased the fracture energy thus improving lowtemperature performance, 5% HBO+5% PHBO performed the best as it wasfound to be different than the control VTB group. Although the mixresults statistics are conclusive, it is still hard to understand if achemical and/or physical interaction is taking place between the VTBbinder and the rejuvenator dosage combination 5% HBO+5% PHBO at lowtemperature. Subsequent research work dealing with analytical chemistrymust be done to better understand what changes are occurring to the VTBbinder for these effects to take place at low temperature.

Example 17—Conclusions

The findings from low temperature and intermediate temperature testingwithin this study show that a combination of HBO and PHBO can besuccessfully used as rejuvenator of VTB and perform equally or betterthan a commercial rejuvenator out in the current market. Throughstatistical analysis, it was shown that at low temperature HBO and PHBOat dosage rates of 5% by weight of the VTB binder combined improveperformance significantly by lowering the stiffness and thus increasingfracture energy. At intermediate temperatures, it was shown that bothrejuvenators at the two dosage levels reduced stiffness in the dynamicmodulus test compared to the control VTB group, but were found to not besignificantly different from one another.

It is recommended that further testing take place at two additionaltemperatures (0° C. and −24° C.) with the SCB test to examine fractureenergy for the five groups. This would be beneficial and help to betterunderstand how the rejuvenators impact mix performance at lowtemperature. Subsequently, it would be helpful if analytical chemicaltesting was done on the rejuvenators, and the VTB binder modified withsaid rejuvenators. It is also recommended that additional dosage ratesand sources of VTB be examined for future mix testing and analysis.

Example 18—Evaluation of the Chemical Aspects of Hydrogenated andNon-Hydrogenated Linseed Oils

Three molecular characterization techniques were completed on themodified vegetable oils [non-hydrogenated linseed oil (“HBL”) and thehydrogenated linseed oil (“PHBL”)]: (1) Fourier Transform InfraredSpectroscopy (“FTIR”), (2) Nuclear Magnetic Resonance (“NMR”), and (3)Size Exclusion Chromatography (“SEC”).

Fourier Transform Infrared Spectroscopy (“FTIR”)—This technique is usedto obtain the infrared absorbance frequency of the sample in order toassist in the assessment of its molecular structure. FIG. 17 shows FTIRabsorbance spectra of HBL and PHBL. The FTIR absorbance spectra shows novisible change when comparing the hydrogenated sample to thenon-hydrogenated part. However the (═C—H) stretch ≈3010 [l/cm]disappears from the HBL to the PHBL. No stretch is seen around the1620-1280 [l/cm] range where alkenes would be expected to appear.

Nuclear Magnetic Resonance (“NMR”)—NMR is a technique used to study thestructural composition of molecules. Atoms' nuclei when exposed to amagnetic field absorb and re-emit electromagnetic radiation depending onthe chemical shift or Zeeman shift of the nuclei present in the sample.FIGS. 18A-18B show the molecular structure of HBL and PHBL along withthe corresponding nuclei's NMR shift prediction of HBL (FIG. 18A) andPHBL (FIG. 18B). FIG. 19 shows the superimposed NMR of the two samples,where the signal corresponding to the hydrogens in the carbon-carbondouble bonds (5.38 ppm), the hydrogens before and after thecarbon-carbon double bond (2.16 ppm) and the hydrogens between twocarbon-carbon double bonds (2.80 ppm) decrease when comparing HBL toPHBL.

Size exclusion chromatography (“SEC”)—SEC is a chromatographic techniqueutilized to calculate the molecular weight of the sample. FIG. 20 showsthe SEC graph of HBL and PHBL samples and no apparent change inmolecular weight can be seen.

Example 19—Mass Loss

Mass loss is an important consideration when determining a material'svalue for rejuvenating stiffer binders. The maximum acceptable mass lossfor a Superpave binder is one percent loss during RTFO aging. For thisstudy, the mass loss was not shown to be highly variable. The controlbinder showed relatively low mass loss as summarized in Table 20. Thereis no clear trend in the data that shows as dosage level increases foreach combination's BDM, the mass loss increases.

TABLE 20 Mass Loss of PG 58-28 with/without bio-derived variantsAdditive Average Mass Loss (%) None 0.16 3% HBL 0.58 1.5% HBL + 1.5%PHBL 0.27 3% PHBL 0.41 1.5% PHBL 0.60 1.5% HBL 0.53 3% HBL + 3% PHBL0.42 1% PHBL 0.32 1% HBL 0.62 1% HBL + 1% PHBL 0.55 1% HBL + 0.5% PHBL0.66 0.5% HBL + 1% PHBL 0.56 2% HBL + 1% PHBL 0.46 1% HBL + 2% PHBL 0.504% HBL + 4% PHBL 0.48 5% HBL + 5% PHBL 0.39 2% HBL + 6% PHBL 0.39 6%HBL + 2% PHBL 0.61

Example 20—Separation Testing Results

The separation tests are performed on the binders containing 4% HBL+4%PHBL, 5% HBL+5% PHBL, 2% HBL+6% PHBL, and 6% HBL+2% PHBL by weight ofthe total binder. The separation testing was performed by placing VTB inmetal cylindrical tubes, crimping the top of the tube closed and storingat 163° C. for 48 hours. After 48 hours, the tubes were carefully placedvertically in a freezer for four hours, after which the tubes were cutinto thirds. For each tube, three DSR tests will be conducted on boththe top and bottom thirds of the tubes. If separation is not identifiedat the higher dosage level combinations, it is reasonable to expect thatlesser amounts will also not have separation issues. For comparing theseparation tests, the temperature at which the binder failed in the DSRoriginal binder test was chosen. Comparisons of the failure temperaturefor the top and bottom portions of each sample are shown for each of theVTB/BDM blends tested in FIGS. 21-24. The graphs for each of the VTB/BDMblends show the failure temperature for the top and bottom of eachsample tested. The red lines show the average failure temperature forthe top and the purple lines show the average for the bottom.

The test results show virtually no evidence of separation in the VTB/BDMblends for the 4% HBL+4% PHBL, 5% HBL+5% PHBL, 2% HBL+6% PHBL, and 6%HBL+2% PHBL by weight of binder. The results presented in this sectionare applicable to the VTB blended with the two BDM using a shear mill at3000 rpm for one hour at 150° C.±10° C. The top and bottom also showonly slight differences. Separation between the BDM and the VTB in theblends is not shown to be a concern.

Example 21—Conclusions

The findings from low temperature and intermediate temperature testingwithin this study show that a combination of HBL and PHBL can besuccessfully used as rejuvenators of VTB and perform equally or betterthan a commercial rejuvenator out in the current market. Throughstatistical analysis it was shown that at low temperature HBL and PHBLat dosage rates of 5% by weight of the VTB binder combined improveperformance significantly by lowering the stiffness and thus increasingfracture energy. At intermediate temperatures, it was shown that bothrejuvenators reduced stiffness in the dynamic modulus test compared tothe control VTB group, but were found to not be significantly differentfrom one another.

From the above results, it can be concluded that the bio-derivedmaterials via vegetable oil (HBL and PHBL) can be used as rejuvenatorsand/or fluxes of stiffer asphalt binders such as vacuum tower bottomsand have the potential to change the original binder performance gradefrom 76-10 to PG 70-22 and PG 64-22 binder grades. The testing planincluded an extensive binder testing plan to fully evaluate thepotential of the two vegetable derived materials and to determineoptimal dosage levels for each material. Binder testing showed how eachBDM impacted rheological properties. The main objectives were to addressfeasibility as well as potential concerns and benefits of using of thebio-derived materials as a rejuvenator and/or flux.

The binder specific gravity testing showed little change with increasingdosage level of each of the two BDM which would not significantly impactmix volumetric calculations. Mass loss data showed little variabilityand usually increased once the BDM was added to the VTB. Yet the massloss criterion of 1.0% was met for all the dosage combinations of theheated bodied linseed oil and partially hydrogenated heated bodiedlinseed oil. The VTB control group is very stiff as the viscosity at135° C. is 1.204 Pa*s, while, at the highest dosage level combination of5% HBL+5% PHBL, the viscosity at 135° C. is 0.652 Pa*s. This is almost a50% drop in viscosity. The DSR test results verify that achieving a hightemperature grade of PG 70 and 64 is possible, but only by using bothHBL and PHBL in combinations of over 3% and 3%. The bending beamrheometer tests show that to achieve a low temperature PG grade of −22,3% of HBL and 3% PHBL must be used in combination. From the analysisusing the prediction equation, it was found that there must be bothmaterials blended with the VTB to achieve a −22 low temperature grade.The data gathered from testing was successfully used to create linearmultiple regression models with coefficient of determination greaterthan 90% for predicting viscosity, RTFO DSR, and BBR results. Overall, adosage rate of at least 3.8% heated bodied linseed oil and 3.0%partially hydrogenated heated bodied linseed oil must be used forachieving a performance grade of 70-22 with the vacuum tower bottoms. Toachieve a performance grade of a 64-22, a dosage rate of at least 4.7%heated bodied linseed oil and 6.5% partially hydrogenated heated bodiedlinseed oil should be used.

Example 22—Further Experimental Materials and Methods

Material Description—VTBs are a very stiff form of asphalt binder thattypically have a performance grade (PG) of 76-10, 82-10, or 82-16.Within this invention, two non-commercial BDMs were used; Heat BodiedLinseed Oil (HBO), and Partially Hydrogenated Heat Bodied Linseed Oil(PHBO), while a commercially available bio-derivedrejuvenator—commercial modifier (CM) derived from Tall oil was alsoused. The BDMs used are produced from locally grown materials in theMidwestern United States and are easy to come by, while the commercialmodifier, CM is a popular rejuvenating agent for asphalt binders, andmixtures in the Midwestern United States. Past literature has shown thatit is possible to convert heavier asphaltenes into maltenes throughhydrogenation reactions (Xu et al., “Hydro-Treatment of Athabasca VacuumTower Bottoms in Supercritical Toluene With Microporous ActivatedCarbons and Metal-Carbon Composite,” Fuel 88:2097-2105 (2009), which ishereby incorporated by reference in its entirety). It is thus felt thatbecause one of the two linseed derived materials, part of the BDMcombination is PHBO, this could cause a reversal of asphaltenes tomaltenes during the blend process. All VTBs have much more asphaltenesthan maltenes. Thus, this process could be repeated with other sourcesof VTB. However, one source of vacuum tower bottoms from an Illinoisrefinery with a penetration grade of 20-30 and a performance grade (PG)of PG 76-10 was used for the work embodied in this set of furtherexamples due to local availability. The properties for thenon-commercial BDMs, HBO, and PHBO are shown in Table 1, supra.

There is only 1 glass transition temperature (T_(g)) for HBO as it is anoily like liquid. However, there are 2 T_(g)s for PHBO as it is a waxtype material and has two different phases at which the material changesin terms of the glass transition temperature. The melting temperaturefor PHBO is relevant because below the temperature of 42.92° C. thereare big differences between viscosities of HBO and PHBO. Once PHBO is at45° C. the viscosity results drop dramatically and by 65° C. are lowerthan viscosity results for HBO. The two materials are added at the sametime to VTB during blending. HBO is poured in like a liquid while PHBOis scooped out of a can and put in the VTB before blending. Both HBO andPHBO have specific gravities similar to asphalt binder. For binderpreparation, the BDMs HBO and PHBO, as well as a commercial rejuvenatorCM were shear blended with VTB at 155° C.±5° C. at 3000 rpm for one hourusing a Silverson shear mill. After all blending combinations werecreated, unaged materials were tested in the DSR. Subsequently, thematerials were then short term aged in a RTFO and material was reservedfor DSR testing. Remaining RTFO aged material was aged in a pressureaging vessel (PAV)—long term aging for subsequent testing in a DSR. Fivegroups were tested and examined; VTB control group, 3% HBO+3% PHBO, 5%HBO+5% PHBO, 6% CM, and 10% CM. All the rejuvenator materials were addedto VTB by percent weight of the binder.

In past testing at Iowa State University, separation testing was done onVTB modified with the combination of HBO and PHBO as well as thecommercial rejuvenator, CM at the same dosages as those used for thissection of further examples. This testing was done in accordance withASTM D7173-14 and unaged binder testing was done in accordance withAASHTO T 315-10. The timing between the different procedures for thiscurrent set of further examples was kept the same for the five bindersin question, and the specimens all went through the same temperatureregime. The specimen temperature testing regime is further explainedbelow.

Binder Test and Analysis Methods—A Dynamic Shear Rheometer (DSR) wasused to test three specimens from each group at each aging condition asshown in Table 21.

TABLE 21 Experimental Test Plan for DSR Use Description Original RTFOPAV Control XXX XXX XXX 3% HBO + 3% PHBO XXX XXX XXX 5% HBO + 5% PHBOXXX XXX XXX 6% CM XXX XXX XXX 10% CM XXX XXX XXX Note: X represents 1specimen.The DSR was used to test the specimens at multiple frequencies (23frequencies ranging between 0.1 Hz and 10 Hz) and at severaltemperatures (20° C., 35° C., 50° C., 65° C., and 80° C.). Using theinformation gained from frequency sweeps across several temperatures|G_(b)*| master curves and black diagrams were developed (AmericanAssociation of State Highway and Transportation Officials, (AASHTO).Determining the rheological properties of asphalt binder using a dynamicshear rheometer (DSR), In: T 315-10, Washington, D.C., which is herebyincorporated by reference in its entirety).

The DSR tests were carried out with the same sample/specimen atdifferent temperatures. The gap and the diameter for unaged, RTFO aged(short-term aged), and PAV aged (long-term aged) testing was 1 mm, and25 mm at temperatures 50° C., 65° C. and 80° C., while at 20° C. and 35°C. the gap and diameter were held at 2 mm and 8 mm. The strain levelswere kept constant at each temperature for the frequency sweep. However,at lower temperatures of 35° C. and 20° C., the strain was held at 1%strain, while at 50° C., 65° C., and 80° C., the % strain was held at10%. These criteria were based on the requirements used for PG gradingof an asphalt binder in a DSR. At low temperatures, 1% strain and 2 mmgap with 8 mm diameter are typically used due to fatigue cracking beingexamined, while at higher temperatures 10% strain and 1 mm gap with 25mm diameter are more commonly used because rutting is examined at hightemperatures.

Before testing began verification of strain rates needed to keep testingwithin the linear viscoelastic range was done. A strain sweep was runfrom 0.5% to 15% with logarithmic ramping for 10 rad/s frequency at eachof the five temperatures (20°, 35° C., 50° C., 65° C., and 80° C.) wasdone using the VTB control group to determine the percent strain neededto stay in the linear viscoelastic range. The specimens tested at 50°C., 65° C., and 80° C. were done with a 25 mm parallel plate with 1 mmgap while the specimens tested at 20° C., and 35° C. were done using an8 mm parallel plate with 2 mm gap. The percent strain rate determinedwas 1% for 20° C., and 35° C. were done using an 8 mm parallel platewith 2 mm gap, while the percent strain rate determined for 50° C., 65°C., and 80° C. were done with a 25 mm parallel plate with 1 mm gap was10%.

Master Curves and Black Diagrams—Within this research a modifiedsigmoidal function developed by Marasteanu and Anderson (Marasteanu, M.& Anderson, D., “Improved Model for Bitumen RheologicalCharacterization,” In: Eurobitume Workshop on Performance RelatedProperties for Bituminous Binders,” Belgium: European BitumenAssociation Brussels (1999), which is hereby incorporated by referencein its entirety) was used to construct binder shear complex modulus|G_(b)*| and phase angle (δ) master curves. The mathematical expressionof the modified sigmoidal function is shown in Equation (13) for log|G_(b)*|. When constructing the phase angle master curve |G_(b)*| issubstituted by S. Equations (14) and (15) represent the fitting of theshift factors through a second order polynomial function.

$\begin{matrix}{{\log{G_{b}^{*}}} = {\delta + \frac{\alpha}{1 + e^{\beta + {\gamma{({{lo}\;{gf}_{r}})}}}}}} & (13) \\{{a(T)} = \frac{f}{f_{r}}} & (14)\end{matrix}$

where

-   -   |G_(b)*|=binder shear complex modulus (Pa);    -   f_(r)=reduced frequency of loading at reference temperature        (Hz);    -   δ, α, β, γ=coefficients;    -   a(T)=shift factor as a function of temperature;    -   f=frequency of loading (Hz);    -   T=temperature (° C.);    -   a(T_(i))=shift factor as a function of Temperature T_(i);    -   a, b, c=coefficients for shift factor.

To construct a master curve the principle of time-temperaturesuperposition must be used with data gained from testing at severalfrequencies and temperatures in conjunction with Equations (13)-(15). Acompleted asphalt binder master curve is a representation of an asphaltbinder's stiffness/phase angle behavior at the reference temperatureover many more frequencies than were used for testing. It is alsopossible to determine shift factors for temperatures not used that arewithin the range of tested temperatures. This enables the constructionof master curve of |G_(b)*| and δ against temperature. For this work areference temperature of 50° C. will be used.

Black diagrams are very powerful in terms of identifying DSR data issuesas they do not require shifting to create one curve from data measuredat different test temperatures. In a Black diagram shifting does notoccur due to the fact that phase angle is plotted against |G_(b)*|regardless of test temperature (Airey, G. D., “Use of Black Diagrams toIdentify Inconsistencies in Rheological Data. Road Mater Pavement Des.3:403-24 (2002); Marasteanu, M. & Anderson, D., “Techniques forDetermining Errors in Asphalt Binder Rheological Data,” Transport Res.Rec.: J. Transport Res. Board 1766:32-9 (2001); Ramond et al.,“Exploring Qualitative Measures of Complex Modulus: Importance of BlackSpace,” In: Eurobitume Congress, Brussels, Belgium, all of which arehereby incorporated by reference in their entirety). This also meansthat errors made in temperature measurement are not displayed in a Blackdiagram. Smooth Black diagram curves result when asphalt binder ischaracterized as being a thermo-rheological simple material tested inthe linear region and errors do not occur during testing. However, iffactors such as testing in the non-linear region, testing errors, and ifthe asphalt binder is not simply thermo-rheological, then the data setsfrom the different temperatures will show up as separate lines from oneanother (Marasteanu, M. & Anderson, D., “Techniques for DeterminingErrors in Asphalt Binder Rheological Data,” Transport Res. Rec.: J.Transport Res. Board 1766:32-9 (2001); Ramond et al., “ExploringQualitative Measures of Complex Modulus: Importance of Black Space,” In:Eurobitume Congress, Brussels, Belgium, both of which are herebyincorporated by reference in their entirety). For the purpose of thisportion of the invention, Black diagrams will be used to examinedifferences between the five groups within each aging category andbetween aging categories. They can be expressly used to show if thephase angle is changing positively, or negatively as well if thestiffness is decreasing or increasing.

Example 23—Discussion of Results and Analysis

Using the sigmoidal function, binder shear complex modulus (|G_(b)*|)master curves were developed for three aging conditions (unaged,short-term aged, and long-term aged) using the results gained fromtesting three specimens from each of the five groups. The |G_(b)*| and δmaster curves are shown in FIGS. 25A-25B, 27A-27B, and 30A-30B.Additionally the un-shifted data for each group at each aging conditionwas used to generate Black Space diagrams (|G_(b)*| vs. δ) as shown inFIGS. 26, 29, and 31.

Unaged Results—From the unaged results shown in FIG. 25A for |G_(b)*|vs. Reduced Frequency all the rejuvenators at their various dosagesappear to shift the VTB curve to the right downward, e.g. decrease thestiffness across all reduced frequencies. The group with the lowestunaged stiffness is the VTB modified with 10% CM. Visually, the VTB hasthe highest unaged stiffness across all reduced frequencies. What isinteresting is that VTB modified with HBO+PHBO has similar unagedstiffness at higher reduced frequencies compared to VTB modified with CMwhile at lower reduced frequencies VTB modified with HBO+PHBO showsincreased stiffness over that of CM. This shows that CM and HBO+PHBOhave different effects on the viscoelastic nature of VTB, especially atlower reduced frequencies/high temperatures. Due to similar effects atlow temperature on stiffness from both CM and HBO+PHBO, and the higherstiffness for HBO+PHBO at high temperatures, the temperature range couldpotentially be wider for the VTB modified with HBO+PHBO than for VTBmodified with CM.

All the rejuvenators are shown to work, but some are more effective atreducing stiffness, such as 10% CM against the performance of 5% HBO+5%PHBO. CM might be better at reducing stiffness than HBO+PHBO over thewhole length of the master curve, but might reduce the stiffness toogreatly at high temperatures/low reduced frequencies, thus lowering thecontinuous grade range of the rejuvenated binder too much. Stiffness isonly one aspect rejuvenators should affect in stiff binders, the otherbeing the phase angle (to examine changes in viscoelasticity). The nextvisual inspection is of the phase angle master curve in FIG. 25B.

From the phase angle master curve shown in FIG. 25B, none of therejuvenators have lower phase angles than the VTB control at higherreduced frequencies/low temperatures, while at the lowest reducedfrequencies/highest temperatures all of the rejuvenators have similarresults as that of the control. Visually, it can be seen that as therejuvenator dosage increases, the phase angle increases with increasedlowering of temperatures. This effect is more dramatic for CM than forHBO+PHBO. Even though it appears that phase angle values are higher asthe temperature goes down for CM and HBO+PHBO, the effects are offset bya decrease in stiffness at low temperatures. Thus, the VTB materialmodified with CM and HBO+PHBO is exhibiting the properties of arejuvenated binder. To look closer at the effect of the rejuvenators onphase angle when no shifting occurs the unaged results were alsoexamined using Black Space diagrams in FIG. 26.

From the Black Space diagram shown in FIG. 26, it is not definitivelyclear what effect the rejuvenators are doing to the VTB at hightemperatures. The location for data from high temperatures is from phaseangle 85° to 90° and from |G_(b)*| 1000 Pa to 10 Pa. The VTB modifiedwith 10% CM is slipping at high test temperatures due to the extremesoftness of the modifier as illustrated by the reduced phase angle atlow |G_(b)*| values. When looking at the low test temperature results,the phase angles 55-70° and |G_(b)*| of 40,300,000 Pa to 500,000 Pa showsoftening for all results for all the rejuvenator groups, howeverchanges in phase angle are different between CM and HBO+PHBO. Therejuvenator CM softens the VTB, but increases the phase angle, thusincreasing the viscous nature of the binder at low temperatures. Theopposite is true for HBO+PHBO, it softens the VTB, and slightlydecreases the phase angle, and thus makes the VTB more elastic innature. Whether or not a rejuvenator works well cannot be decided simplyfrom unaged data, but through examination of short-term aged, andlong-term aged data along with statistical analysis as shown inpreceding examples.

RTFO (Short-Term) Aged Results—All of the rejuvenator groups shift theVTB control curve to the right downward, e.g. decrease the stiffnessacross all reduced frequencies in FIG. 27A for the short-term agedresults. The same trend seen for the unaged data is not seen between thegroups (6% CM, 3% HBO+3% PHBO, and 5% HBO+5% PHBO) for the short-termaged data. By comparing unaged to short-term aged results there is aslight stiffening of all the rejuvenator groups with short-term aging.This slight stiffening between unaged and short-term aged materials isshown in FIGS. 28A-28B for 3% HBO+3% PHBO, and 6% CM. It should be notedthat the VTB control group only stiffens with short-term aging at thelow frequency/high temperature side of the master curve plot, but not atthe high frequency/low temperature side of the plot. As seen for theunaged results VTB modified with 10% CM shows the lowest stiffness forshort-term aged results. Visually, it may seem there is only a slightstiffening due to short-term aging, but it is possible changes are muchmore dramatic. This is because results are presented in log-log scale.To more closely examine how big of an effect short-term aging had onstiffness, percent difference values were determined from the measureddata as shown in Table 22.

TABLE 22 |G_(b)*| % Difference Between Rejuvenators and Control forUnaged and Short-Term Aged Binders DSR unaged DSR RTFO % Diff % Difffrom from Name |G_(b)*|, kPa control |G_(b)*|, kPa control Control3.09E+03 0.00 4.69E+03 0.00 3% HBO + 3% PHBO 9.10E+02 −70.53 1.57E+03−66.54 5% HBO + 5% PHBO 4.58E+02 −85.18 1.23E+03 −73.73 6% CM 5.43E+02−82.42 1.29E+03 −72.48As can be seen from the results, the effect from short-term aging isquite significant on stiffness. The changes are similar when usingeither BDMs or CM as a rejuvenator. Master curve plots only show thesoftening effect of the rejuvenators on the VTB, not the effects to theviscoelastic nature of the VTB.

The second visual inspection for master curve results is the phase anglemaster curve in FIG. 27B. In FIG. 27B, the majority of rejuvenators havephase angle results above the control VTB, except for the 5% HBO+5% PHBOmodified VTB. The 5% HBO+5% PHBO modified VTB has phase angle resultsoverlapping with the control VTB. The turn in the VTB control curve atthe higher reduced frequencies and the twist of the 10% CM curve at lowreduced frequencies are due to the material being too stiff (fractureoccurring), and the material being too soft. For the rejuvenator CM thesame trend is occurring as happened in FIG. 25B, when the rejuvenatordosage increases, the phase angle increases with increased lowering oftemperatures. This effect is indicative of the greater differencebetween the storage and relaxation modulus for CM modified VTB than forHBO+PHBO modified VTB. For closer inspection of the effects fromrejuvenator addition and dosage level on phase angle results Black Spacediagrams are used as shown in FIG. 29.

From the Black Space diagram using short-term aged results, it still notclear if any effect is happening at high temperatures as shown from therange of phase angle 85° to 90° and from |G_(b)*| 1000 Pa to 15 Pa.However, it can be seen that even with short-term aging, the VTBmodified with 10% CM is still too soft to test at higher temperatures asshown by the slipping in the test results at 80° C. when no slipping isseen at 65° C. When looking at the results from lower test temperatures,20° C., 35° C., and 50° C. increasing combination dosage of HBO+PHBO hasa beneficial effect on both the phase angle and |G_(b)|, through adecrease in phase angle up to 4° and a decrease in stiffness of up to8,000,000 Pa. Increasing dosage of the commercial rejuvenator CM has theopposite effect on phase angle, but still decreases stiffness inshort-term aged VTB. It increases the phase angle by as much as 10° atthe lowest temperature 20° C., which means the modified VTB becomes muchmore viscous at low temperature. This observation seen in the short-termaged results agrees with the results seen in the unaged results for thecommercial rejuvenator CM.

PAV (Long-Term) Aged Results—The four rejuvenator groups shift the VTBcontrol curve to the right downward, e.g. decrease the stiffness more athigher reduced frequencies than at lower reduced frequencies as shown inFIG. 30A for the long-term aged results. Higher frequencies relate tolower test temperatures. However, the two rejuvenator groups with thecommercial rejuvenator CM decrease stiffness immensely at lowerfrequencies/higher temperatures, while the two rejuvenator groups withHBO+PHBO have slightly lower stiffness at low frequencies/hightemperatures when compared to the VTB control group. The two rejuvenatorgroups HBO+PHBO cause a slope shift from low to high frequencies (highto low temperatures) that rotates the curve downward towards the rightwhile leaving the left portion of the curve unchanged. This meansHBO+PHBO spread the grade range further from critical high to criticallow temperature, while CM does not change the spread of the grade range,but rather shifts it downward overall at both critical high and criticallow temperatures.

From this plot when comparing to previous plots in FIGS. 25A and 27A,aging is seen to have more of an effect on VTB modified withrejuvenators when short-term aging occurs rather than long-term aging.The effects of PAV (long-term) aging against that of no aging on thestiffness are shown in Table 23 through percent difference values.

TABLE 23 |G_(b)*| % Difference Between Rejuvenators and Control ForUnaged and Long-Term Aged Binders, and PG Grades DSR unaged DSR PAV %Diff % Diff Continuous |G_(b)*|, from |G_(b)*|, from grade PG Name kPacontrol kPa control (° C.) grade Control 3.09E+03  0.00 6.05E+03  0.0080.5-14.1 76-10 3% HBO + 9.10E+02 −70.53 2.47E+03 −59.19 72.8-22.0 70-163% PHBO 5% HBO + 4.58E+02 −85.18 1.98E+03 −67.31 68.4-26.0 64-22 5% PHBO6% CM 5.43E+02 −82.42 2.27E+03 −6242 69.9-22.7 64-22 10% CM 1.73E+02−94.40 9.82E+02 −83.77 63.0-26.5 58-22Additionally PG grades are shown for the five binders. From the resultsit can be seen that CM has a substantial effect on the high temperaturePG, and could cause rutting problems. The percent difference resultsbetween long-term aged and unaged show the same trends as short-termaged to unaged difference results, however the percent difference valuesare slightly lower. These results clearly show that short-term aging hasmore of an effect on stiffness.

The average phase angle master curve results are shown in FIG. 30B.There are many discontinuities in the low reduced frequency/high phaseangle domain of the plot. The trends for HBO+PHBO are very differentfrom that of CM when compared to the control VTB. Groups with HBO+PHBOhave lower phase angle results at lower reduced frequencies/highertemperatures while CM groups have the reverse compared to the control.The rejuvenator CM shows trends that are similar to the VTB control butare shifted up. This is not the case for HBO+PHBO, as it seems thatthere is a slope shift in the y-direction around one point (between1E+03 and 1E+04 in reduced frequency). By comparing these results tothose seen in FIG. 27B, it seems that HBO+PHBO lessening the effect ofaging on the phase angle while CM is increasing the negative effect ofaging on the phase angle at high temperatures/low reduced frequencies.To get a closer inspection on the effects of the rejuvenators on VTBafter long-term aging without relying on shifting, a Black Space diagramwas constructed as shown in FIG. 31.

At high temperatures, the Black Space diagram of long-term aged resultsin FIG. 31 shows that the rejuvenator groups using HBO+PHBO decrease thestiffness and phase angle from the results of the VTB control group,while CM does not decrease phase angle, but decreases stiffness to thepoint that slipping occurs during testing at 80° C. At low temperatures,HBO+PHBO decreases the stiffness, but not the phase angle. On the otherhand, the rejuvenator CM decreases stiffness, and increases phase angleat low temperature. By looking at the lower temperature side of theplot, 20° C. and 35° C. (between phase angles 28° and 50°) if therejuvenator causes the curve to be below the VTB control curve it can beinferred that there is increased elasticity of the binder at low andintermediate temperatures. However, if a rejuvenator causes the curve tobe above the VTB control curve in this range of phase angles, then itcan be there is increased viscosity at intermediate and lowtemperatures. Further statistical analysis is needed to quantify theresults shown from the three aging conditions of the 4 rejuvenatorsgroups and VTB control group.

Comparison of Aging and Other Effects/Statistical Analysis—For thestatistical analysis of the δ and |G_(b)*| results two separate analysesof variances (ANOVA)s were conducted to examine how the factors groupname (rejuvenator), temperature, frequency, and age and theirinteractions affect performance. The statistical design used is a splitplot repeated measured (SPRM) design. The whole plots are the modifiedVTB groups (group name), or five rejuvenator groups, and the whole plottreatment factor is age (3 aging conditions).

The split plots are the specimens within each of the treated whole plots(thus forty-five specimens in total). The split plot treatment factorsare frequency and temperature. Randomization comes from varying theorder of testing for the forty-five specimens used. The most importantand interesting results (significant results) are described below.

Phase Angle Results—FIG. 32 shows a plot of least square means values ofphase angle with standard error bars for each binder tested. Due to thebars signifying standard error in each direction, it is not clear whichgroups are different from one another in terms of phase angle. However,it can be seen that when VTB is modified with the commercial rejuvenatorCM, phase angle increases, thus implying increase in viscous nature ofthe binder. It is hard to tell if the rejuvenator HBO+PHBO increases ordecreases the phase angle enough to change the nature of the VTB binder.To better examine if there is differences between the groups a Tukeyhonestly significant difference (“HSD”) least square means differencetest was done, where the results are shown in Table 24.

TABLE 24 Tukey HSD Least Square Means Difference of δ (°) For Group NameLevel Least Sq mean 10% CM A 76.84 6% CM B 74.77 3% HBO + 3% PHBO C69.03 VTB D 67.20 5% HBO + 5% PHBO D 66.72 Note: Levels not connected bysame letter are significantly different.Levels that are not connected by the same letter are significantlydifferent according to a 95% confidence interval. From the resultsshown, the group 5% HBO+5% PHBO is not different from the VTB controlgroup in terms of phase angle performance. The other three rejuvenatorgroups (3% HBO+3% PHBO, 6% CM, and 10% CM) are significantly differentfrom both the VTB control group and the 5% HBO+5% PHBO group. Thesethree groups are also shown to be different from one another with 10% CMhaving the highest phase angle, and 3% HBO+3% PHBO having the lowestphase angle of the three aforementioned. This table of the differencesgives a clearer picture of which rejuvenator groups are increasing thephase angle and thus increasing the viscous nature of the VTB binder,with 10% CM creating the biggest increase to viscous nature. This resultfor CM also is in agreement with FIGS. 26, 29, and 31 described above.

Shown below in FIG. 33 is the least squares means plot for theinteraction between Group Name and Age for phase angle. Clearly, agingis shown to impact changes in phase angle for the four rejuvenatorgroups when compared to changes in the VTB control group. From theresults shown, the rejuvenator CM across all three aging conditions hasmuch higher phase angle than the VTB control group, whereas therejuvenator group 5% HBO+5% PHBO shows the biggest drop in phase angleacross the aging conditions from Unaged to PAV aged. The rejuvenator CMappears to just shift the phase curves upward, but does not change theslopes between the aging conditions like that of HBO+PHBO. It appearsthat HBO+PHBO is rheologically changing the viscoelastic nature of VTBwith prolonged aging. It is clear there are differences between groupswithin each age and differences due to aging within each group, but itis not known if the differences are statistically significant withoutrunning a Tukey HSD test.

To see if the differences between groups based on different aging aresignificant a Tukey HSD test was done using least square meandifferences as shown in Table 25.

TABLE 25 δ Tukey HSD Lease Square Means Difference for Interaction GroupName by Age Least sq Level mean 10% CM, unaged A 82.65 6% CM, unaged B81.03 5% HBO + 5% PHBO, C 78.16 unaged 10% CM, RTFO C 77.93 3% HBO + 3%PHBO, C D 77.21 unaged 6% CM, RTFO D 76.54 VTB, unaged E 74.93 3% HBO +3% PHBO, F 72.25 RTFO 10% CM, PAV G 69.95 VTB, RTFO G 69.48 5% HBO + 5%PHBO, G 69.44 RTFO 6% CM, PAV H 66.74 3% HBO + 3% PHBO, I 57.63 PAV VTB,PAV I 57.20 5% HBO + 5% PHBO, J 52.56 PAV Note: Levels not connected bysame letter are, significantly different.The most interesting information on unaged groups shown in Table 25 isthat all four rejuvenator groups are significantly different than theVTB control group with their phase angles being higher on average.However, the HBO+PHBO groups were found to not be different from oneanother in terms of phase angle. It was also seen that CM made the VTBthe most viscous when unaged. When looking at the short-term agedresults, nothing really changes trend wise from the unaged results otherthan the fact that 5% HBO+5% PHBO is now found to be statistically thesame as the control VTB group, while the others are statisticallydifferent from the VTB control group and 5% HBO+5% PHBO group. The trendthat shows for RTFO aged results appears again in the PAV aged(long-term aged) results, but is shown to be more drastic than before.Now 5% HBO+5% PHBO has the lowest phase angle and is statisticallydifferent from the VTB control group, while 3% HBO+3% PHBO was not foundto be different from the control group. CM is still different than theVTB control group, but has much larger phase angle values in the rangeof 66.7° up to 70°, while the VTB control group's phase angle result is57.2°. These results mean that HBO+PHBO are changing the VTB to becomemore elastic with aging, while CM is changing the VTB to become moreviscous with aging. Further proof of these results are shown whenlooking at the least square means plot for the interaction between GroupName and Temperature as shown in FIG. 34.

Complex Shear Modulus |G_(b)*| Results—To examine the effects of thefactors and their interactions on the complex shear modulus |G_(b)|, ffrom use of HBO+PHBO and CM as rejuvenators, a full statistical analysisusing an ANOVA table was done. Before an ANOVA can be done, the spreadof the data must be examined to see if the variance across alltemperatures follows the rule of normality. This spread of data is shownin FIG. 35. From the results shown, the rule of normality is not met,thus data transformation can be done to see if the rule of normality ismet for variance of data across temperatures. The data was transformedusing Log 10 and is shown in FIG. 36. Using a Log 10 transformation onthe data makes the rule of normality be met for the variance across thetemperatures. Therefore, Log 10 transformed data will be used forcreating the ANOVA.

FIG. 37 displays a plot of least square means values of log10 |G_(b)*|with standard error bars for the factor Group Name. Because the bars ineach direction is standard error, it is difficult to tell which groupsare different from one another statistically in terms of log10 |G_(b)*|.It is clear from the plot that all the rejuvenator groups decrease theshear complex modulus |G_(b)*|, with CM decreasing it the most (making|G_(b)*| an order of magnitude smaller). Due to statistical differencesnot being displayed clearly in FIG. 37, a Tukey honestly significantdifference (HSD) least square means difference test was done as shown inTable 26.

TABLE 26 Tukey HSD Least Square Means Difference of log10 |G_(b)*| forGroup Name Level Least sq mean VTB A 5.19 3% HBO + 3% PHBO B 4.77 5%HBO + 5% PHBO B 4.73 6% CM C D 4.52 10% CM D 4.10

When levels are not connected with the same letter, this means thesegroups are statistically significantly different from one anotheraccording to a 95% confidence interval. From the results shown in Table26, both HBO+PHBO groups were not found to be different from oneanother, but both were found to be different than the control VTB group.The biggest differences were seen between 10% CM and the other fourgroups as well as 6% CM and the HBO+PHBO and VTB control groups. 10% CMwas found to be the least stiff with 6% CM closely following, but bothwere found to be different from one another. The Tukey HSD test of leastsquares means is in agreement with the results shown in FIGS. 25A, 27A,and 30A.

To examine the interaction between Group Name and Age visually a leastsquare means plot of log10 |G_(b)| results is shown in FIG. 38. From theplot, it is observed that aging affects the group 5% HBO+5% PHBO more sothan the other rejuvenator groups as its line of values does not followthe same trend as the other three rejuvenator groups and VTB controlgroup. Aging is shown to have more of a drastic increase on stiffnesswhen 5% HBO+5% PHBO are used. It is clear from FIG. 38 that therejuvenator CM decreases stiffness with increasing dosage the mostacross all three aging conditions. Statistical analysis will give abetter story and explain if there are true differences between groupswithin each age and differences due to aging within each group. To dothis a Tukey HSD test was done as shown in Table 27.

To truly see if differences exist between groups within each agingcondition and within a group using different aging conditions a TukeyHSD test was done using least square mean differences as shown in Table27. For all three aging conditions, the four rejuvenator groups werefound to be statistically significantly different from the control VTBgroup. Within the short-term aged (RTFO) and long-term aged (PAV)conditions, the two HBO+PHBO rejuvenator groups were not found to bedifferent from one another. For the unaged conditions they were found tobe different from one another. The rejuvenator groups using CM werefound to be different from one another within each aging condition aswell as different from the other two rejuvenator groups using HBO+PHBOwithin each aging condition. The results in Table 27 agree with theresults shown in FIG. 38 as the groups using the rejuvenator HBO+PHBOare shown to increase the stiffness closer to the stiffness of the VTBcontrol group with increased aging. These results show that all therejuvenators do soften the VTB, but are affected differently by aging.The results might appear differently when looking at the interactionbetween binder type and temperature.

To examine visually the interaction between binder type and temperaturea least square means plot was created and shown in FIG. 39. From theplot, the rejuvenator CM reduces the stiffness with increasing dosage,but does not change the slope of the trend from high to lowtemperatures. When examining HBO+PHBO, especially the group 5% HBO+5%PHBO, at higher temperatures this group's stiffness is very close to thestiffness of the VTB control group. As the temperature goes down theslope of the line changes and it appears that 5% HBO+5% PHBO softensmuch more drastically at lower temperatures. What this shows is thatHBO+PHBO keeps the VTB modified binder relatively stiff at hightemperatures, therefore keeping the high temperature grade close to theVTB's original high temperature grade while at low temperatures softensthe binder much more and improves the low temperature performance grade.The change in the slope of the stiffness is a significant findingshowing that the combination of the HBO, a lower molecular weightadditive, and PHBO, an additive more similar to wax molecular weightwill help to reduce stiffness at intermediate temperatures.

Example 24—Conclusion

The findings from running frequency sweeps from 20° C. up to 80° C.using a dynamic shear rheometer on unaged, short-term aged, andlong-term aged material, show that the BDM combination derived fromlinseed oil (HBO+PHBO) when used as a rejuvenator of VTB worksdifferently than the commercial rejuvenator CM, but still acts as arejuvenator at all three aging conditions as does the rejuvenator CM interms of stiffness (G*). This is not the case for phase angle whenexamining the performance of CM at the three aging conditions. Therejuvenator CM appears to make the VTB more viscous in nature (based onphase angle results). When examining the phase angle performance ofHBO+PHBO with temperatures changes and changes in aging, it appears thatHBO+PHBO decreases the phase angle with more aging at lowertemperatures, while holding the phase angle steady at highertemperatures. This means that the VTB modified with HBO+PHBO is becomingmore elastic at lower temperatures and with more aging.

The rejuvenator HBO+PHBO softens VTB more at low temperatures than athigh temperatures, while CM gives an overall shift downward in stiffnessfrom high to low temperatures. The impact from testing temperature couldbe hidden when looking at the differences between the groups at theirrespective aging conditions as a greater number of high testtemperatures were used. This does not take away that it is more likelythat HBO+PHBO provides a wider continuous grade range than therejuvenator CM purely from the stiffness results. When taking intoaccount the changes to phase angle and stiffness with aging andtemperature, it appears that both HBO+PHBO and CM are acting likerejuvenators in that both are improving the low temperature performance.However, it is observed that BDMs HBO+PHBO perform better than CM asboth phase angle and stiffness decrease at low temperatures while onlystiffness decreases at low temperature for CM. It is recommended that inthe future analytical chemical testing take place such as massspectrometry on specimens from each of the aged conditions so that theeffects seen physically and rheologically in the results of this papercan be further explained by examining changes in chemistry of thecompounds at the molecular level.

Although preferred embodiments have been depicted and described indetail herein, it will be apparent to those skilled in the relevant artthat various modifications, additions, substitutions, and the like canbe made without departing from the spirit of the invention and these aretherefore considered to be within the scope of the invention as definedin the claims which follow.

1.-34. (canceled)
 35. A method of producing an asphalt productcomprising: providing an asphalt binder, wherein the binder is a vacuumtower distillation bottom; providing a bio-oil blend comprising amixture of a non-hydrogenated bio-oil and a partially hydrogenatedbio-oil; and mixing the asphalt binder with the bio-oil blend underconditions effective to produce an improved asphalt product having ashear stiffness of 0.20 kPa to 11,000 kPa at a temperature ranging from25° C. to 85° C. and/or a viscosity of 0.15 Pa·s to 1.50 Pa·s at atemperature ranging from 120° C. to 165° C.
 36. The method of claim 35,wherein the binder is a vacuum tower distillation bottom.
 37. The methodof claim 35, wherein the asphalt product has a shear stiffness of 0.20kPa to 11,000 kPa at a temperature ranging from 25° C. to 85° C.
 38. Themethod of claim 35, wherein the asphalt product has a viscosity of 0.15Pa·s to 1.50 Pa·s at a temperature ranging from 120° C. to 165° C. 39.The method of claim 35, wherein the asphalt product has a shearstiffness of 0.20 kPa to 11,000 kPa at a temperature ranging from 25° C.to 85° C. and a viscosity of 0.15 Pa·s to 1.50 Pa·s at a temperatureranging from 120° C. to 165° C.
 40. The method of claim 35, wherein thebio-derived material comprises from 0.1 to 10.0 wt. % of the asphaltproduct.
 41. The method of claim 35, wherein the bio-oil is from an oilderived from a source selected from the group consisting of fish,animal, vegetable, synthetic and genetically-modified plant oils, andmixtures thereof.
 42. The method of claim 41, wherein the bio-oil is avegetable oil from a vegetable source selected from the group consistingof high erucic acid rapeseed, soybean, safflower, canola, castor,sunflower, palm, and linseed oil.
 43. The method of claim 35, whereinthe bio-oil is linseed oil.
 44. The method of claim 43, wherein thebio-oil blend is a mixture of heat-bodied linseed oil (HBL) andpartially hydrogenated heat-bodied linseed oil (PHBL).
 45. The method ofclaim 43, wherein the linseed oil is a partially hydrogenatedheat-bodied linseed oil (PHBL).
 46. The method of claim 35, wherein theproduct has a specific gravity of 1.019-1.052.
 47. The method of claim35 further comprising: blending a mineral aggregate with said improvedasphalt product.
 48. The method of claim 47, wherein the mineralaggregate is selected from the group consisting of sand, gravel,limestone, quartzite, and crushed stone.
 49. The method of claim 35,wherein the product is in the form of asphalt concrete.
 50. The methodof claim 35, wherein the product is in the form of an asphalt mixture.51. The method of claim 50, wherein the asphalt mixture comprises:providing fiberglass and blending the fiberglass with a mineralaggregate including at least one of lime dust and granular ceramicmaterial.
 52. The method of claim 35, wherein the asphalt bindermodifier further comprises a carboxyl additive.
 53. The method of claim35, wherein the asphalt binder further comprises a styrene-butadienetype polymer.
 54. The method of claim 35, wherein the mixing is carriedout in a high speed shear mill at 150° C. to 160° C.
 55. A method ofapplying an asphalt product to a surface, said method comprising: (a)providing the asphalt product of claim 35, (b) heating the asphaltproduct to a temperature of 145° C. to 155° C. to coat the mineralaggregate and produce an asphalt material which has improved rheologicalproperties compared to that of an asphalt material absent thebio-derived material; (c) applying the heated asphalt material to asurface to be paved to form an applied paving material; and (d)compacting the applied paving material.